as if和as though有什么区别？

as if 好像，好似 She spoke to me as if she knew me. 她和我说话的神情，好像她早就认识我似的。 (= as though) as if 的用法 一、as if 从句的作用 1． 在look, seem 等系动词后引导表语从句。如： She looks as if she were ten years younger． 她看起来好像年轻了十岁。 It seems as if our team is going to win． 看来我们队要胜了。 2． 引导方式状语从句。如： She loves the boy as if she were his mother． 她爱这男孩，就好像她是他的母亲一样。 The child talked to us as if he were a grown?up． 那孩子跟我们谈起话来，像个成年人似的。 二、as if 还可用于省略句中 如果as if 引导的从句是“主语＋系动词”结构，可省略主语和系动词，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。如： He acts as if （he was） a fool． 他做事像个傻子。 Tom raised his hands as if （he was going） to say something． 汤姆举起手好像要说什么。 She left the room hurriedly as if （she was）angry． 她匆忙离开房间好像生气的样子。 三、as if 从句的语气及时态 1． as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生或存在的事实时。如： It sounds as if it is raining． 听起来像是在下雨。 He talks as if he is drunk． 从他谈话的样子来看他是醉了。 2． as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下： （1）如果从句表示与现在事实相反，谓语动词用一般过去时。如： You look as if you didn" t care． 你看上去好像并不在乎。 He talks as if he knew where she was． 他说话的样子，好像他知道她在哪里似的。 （2）从句表示与过去事实相反，谓语动词用“had＋过去分词”。如： He talks about Rome as if he had been there before． 他说起罗马来好像他以前去过罗马似的。 The girl listened as if she had been turned to stone． 那女孩倾听着，一动也不动，像已经变成了石头似的。 （3）从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。如： He opened his mouth as if he would say something． 他张开嘴好像要说什么。 It looks as if it might snow． 看来好像要下雪了。

It looks as if it is going to rain看上去天要下雨了。【非虚拟语气】He talked as if he had seen the accident.他讲话的感觉是他好像看见这事故。【虚拟语气】简明释义as if好像， 似乎， 仿佛；恍；宛然；恍若as if网络释义1. 好像2. 犹如3. 好似4. 宛若5. 如临深渊用法as if 从句的作用1．引导表语从句， 常与as,look, seem,feel,taste,smell,sound等系动词连用。如：She looks as if she were ten years younger．她看起来好像年轻了十岁。It seems as if our team is going to win．看来我们队要胜了。It looks as if a tornado swept through your room.好像有龙卷风席卷过你的房间。It looks as if they"re looking for something.他们看起来好像在找什么东西。2. 引导方式状语从句，表示“事情是怎么做的”或“一个人或事物是什么样的”。如：She loves the boy as if she were his mother．她爱这男孩，就好像她是他的妈妈一样。The child talked to us as if he were a grown-up．那孩子跟我们谈起话来，像个成年人似的。She spoke to me as if she knew me.她和我说话的神情，好像她早就认识我。You answered the question as if you did not know this rule.你回答的问题好像不知道这个规则似的。as if 还可用于省略句中如果as if 引导的从句是“主语+系动词”结构，可省略主语和系动词，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。如：He acts as if （he were） a fool．他做事像个傻子。Tom raised his hands as if （he was going） to say something．汤姆举起手好像要说什么。She left the room hurriedly as if （she was）angry．她匆忙离开房间好像生气的样子。as if 从句的语气及时态1． as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生或存在的事实时。如：It sounds as if it is raining．听起来像是在下雨。He talks as if he is drunk．从他谈话的样子来看他是醉了。The boss speaks aloud as if he is angry.老板说话声音很高，好像他真的生气了。He is a happy-go-luck man as if he has no worries and cares in the world.他是一个很快乐的人，似乎无忧无虑。2．as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下：（1）如果从句表示与现在事实相反，谓语动词用一般过去时。如：You look as if you didn" t care．你看上去好像并不在乎。He talks as if he knew where she was．他说话的样子，好像他知道她在哪里似的。When a pencil is partly in a glass of water,it looks as if it were broken.当一支铅笔部分地放在水中时，它看上去像是折断了。（2）从句表示与过去事实相反，谓语动词用“had+过去分词”。如：He talks about Rome as if he had been there before．他说起罗马来好像他以前去过罗马似的。The girl listened as if she had been turned to stone．那女孩倾听着，一动也不动，像已经变成了石头似的。Everythings in my childhood crowded in my mind as if they had just happened.童年发生的一切都挤在我的脑海，仿佛就像刚刚发生的一样。（3）从句表示与将来事实相反，谓语动词用“would/could/might+动词原形”。如：He opened his mouth as if he would say something．他张开嘴好像要说什么。It looks as if it might snow．看来好像要下雪了。(4)as if 后面可以接陈述语气和虚拟语气，如果句子的情况是真实的，那么只要保持时态一致即可，如果后面接的并非真实情况，则要按照虚拟语气规则把句子形式改变（简单说就是时态倒退原则）。(5) as if 在俚语中能表示反讽，功能类似"like"，举例：As if / Like you are going to do the dishes；"like"不能独立成句，但as if 能（完整句子为：as if that/it is true.），例子：甲：She said she would help me with the project. 乙：As if！(6)谈论过去情形的动词形式有以下几种：a)过去式，表示过去的状态，如：He looked at me as if I were mad. 他那样看我，好像我是个疯子。He stood there looking at the train and laughing, as if to miss a train was the best joke in the world.他站在那里，望着火车哈哈大笑，好像误了火车是天底下最开心的事儿似的。Mr. Coleman always talked as if he knew everything.但是，如果状态动词带有持续时间状语，则用过去完成时：They talked as if they had been friends for years. (高二册，第95页)Now it is as though she had known Millie for years. (《现代英语用法词典》)情态动词亦用过去时：She felt as though she could hardly endure such a life.她觉得简直无法忍受这样的生活。b)过去完成时，表示过去的动作先于主句动词而发生或完成，如：It was as if he had lost his last friend. “I remember,” she tells her children now, “how wild his whitehair looked——as if it had been electrified.”（高二册，第91页）必须注意的时，在指过去的动作时，即使主句是现在时，as if 从句中的动词也要用过去完成时：You look as if you"d seen a ghost. 你好像是见了鬼似的。He talks about Rome as though he had been there himself.他讲起罗马的情况来就好像他亲自到过那里似的。c)过去进行时，表示动作正在进行：He heard a noise, as if someone was brea[1]thing.（高一册，第211页）He ran as if ghosts were chasing him.I felt as if the ground were slipping beneath my feet. 我感到大地仿佛在脚下滑动。d)过去将来时，表示将要发生的事态：It looked as if it was going to snow. （高一册，第127页）He opened his lips as if he would say something to you.折叠编辑本段举例it seems as if it is raining。外面看起来象是下雨了。（确实是下雨了）it seems as if it were raining。外面看起来好像下雨一样。（虚拟语气，似乎，其实并没有下雨）

"as if" 和 "as though"是两个连词，都用来表达一种假设或类比的关系，但用法有些微妙的区别。1. "As if"通常用于描述虚拟情况或假设的情况，强调的是一个非真实的假设或想象。例如，“She acted as if she didn"t know me.”（她的举动好像不认识我一样。）2. "As though"也用于描述虚拟情况或假设的情况，但它更强调的是类比的关系。例如，“She looks as though she"s seen a ghost.”（她看起来好像看到了鬼。）总结来说，"as if"用于更强调虚拟的情况，而"as though"更强调的是类比的关系。

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一、as if 从句的作用 　　1． 在look, seem 等系动词后引导表语从句。 　　如：She looks as if she were ten years younger． 　　她看起来好像年轻了十岁。 　　 　　2． 引导方式状语从句。 　　如：She loves the boy as if he were her father． 　　她爱这男孩，就好像他是她的父亲一样。 　　 二、as if 还可用于省略句中如果as if 引导的从句是“主语+系动词”结构，可省略主语和系动词，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。 　　如：He acts as if （he were） a fool． 　　他做事像个傻子。 　　 　　She left the room hurriedly as if （she were）angry． 　　她匆忙离开房间好像生气的样子。 　　三、as if 从句的语气及时态 　　1． as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生或存在的事实时。 　　如： It sounds as if it is raining． 　　听起来像是在下雨。 　　He talks as if he is drunk． 　从他谈话的样子来看他是醉了。 　　2．as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下： 　　（1）如果从句表示与现在事实相反，谓语动词用一般过去时。 　　如： You look as if you didn" t care． 　　你看上去好像并不在乎。 　　（2）从句表示与过去事实相反，谓语动词用“had+过去分词”。 　　如：He talks about Rome as if he had been there before． 　　他说起罗马来好像他以前去过罗马似的。 　　（3）从句表示与将来事实相反，谓语动词用“would/could/might+动词原形”。 　　如： He opened his mouth as if he would say something． 　　他张开嘴好像要说什么。 　　It looks as if it might snow． 看来好像要下雪了。 　　(4)as if 后面可以接陈述语气和虚拟语气，如果句子的情况是真实的，那么只要保持时态一致即可，如果后面接的并非真实情况，则要按照虚拟语气规则把句子形式改变（简单说就是时态倒退原则）。 　　(5) as if 在俚语中能表示反讽，功能类似"like"，举例：As if / Like you are going to do the dishes；"like"不能独立成句，但as if 能（完整句子为：as if that/it is true.），例子：甲：She said she would help me with the project. 乙：As if！

一、文法不同　as if 引导的方式状语从句或表语从句，用虚拟语气。例句：　He acts as if he knew me. 他显得认识我似的。as though 表示与现在事实相反，谓语动词，用would (might, could)+动词原形。例句：They treat me as though I were a stranger. 他们待我如陌生人。二、时态不同as if 表示与过去事实相反，用过去完成时。例句：This meat tastes as if it has already gone bad. 这肉吃起来似乎已经坏了。as though 表示将来的可能性不大，用一般过去时。例句：I feel as though I"m floating on air. 他感到好像漂浮在空中。三、语境不同as if 用来描述比较悲惨的境遇或者状况。例句：It is not as if he were poor. 他不像穷的样子(或他又不穷)。as though 语境属于中性，可以用到很多情境中。

1、as if后接表语从句。当as if后接表语从句中，其通常用于“It loos/seems as if…”的句型中，表示“看起来似乎……”。2、as if后接状语从句。当as if后接状语从句，其含义为“似乎，就好像……”。当所描述的内容，是真实的或极有可能发生或存在的事实，从句通常用陈述语气，句子的谓语用look，seem，taste，smell，feel等。3、as if后从句也可以用虚拟语气。as if的谓语动词有时也要使用虚拟语气，用来表示句子中所描述的情况与事实相反，或极少情况发生的情况。

基本用法. 以as if (as though)引导的方式状语从句或表语从句，有时用虚拟语气，若表示与现在事实相反，谓语动词用一般过去时；若表示与过去事实相反，用过去完成时；表示将来的可能性不大，用would (might, could)+动词原形。. 如：. He acts as if he knew me. 他显得认识我似的。. They treat me as though I were a stranger. 他们待我如陌生人。. He talks as if he had been abroad. 他说起话来好像曾经出过国。.注意 It isn"t as if…的翻译：It isn"t as if he were poor. 他不像穷的样子(或他又不穷)。It isn"t as if you were going away for good. 又不是你离开不回来了。I feel as if [as though] I"m floating on air. 他感到好像漂浮在空中。The stuffed dog barked as if it is [were, was] a real one. 玩具狗叫起来像真狗。

asif从句用虚拟语气的情况。当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下：（1）如果从句表示与现在事实相反，谓语动词用一般过去时。如：Youlookasifyoudidn"tcare．你看上去好像并不在乎。Hetalksasifheknewwhereshewas．他说话的样子，好像他知道她在哪里似的。（2）从句表示与过去事实相反，谓语动词用“had＋过去分词”。如：HetalksaboutRomeasifhehadbeentherebefore．他说起罗马来好像他以前去过罗马似的。Thegirllistenedasifshehadbeenturnedtostone．那女孩倾听着，一动也不动，像已经变成了石头似的。（3）从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。如：Heopenedhismouthasifhewouldsaysomething．他张开嘴好像要说什么。Itlooksasifitmightsnow．看来好像要下雪了。

as if好像，仿佛，似乎=as thoughif 假如，如果，倘若，表示假设关系

没区别，as if与as though是一组同义词，两者意思相同，用法也相同。as if = as though，常用来引导一个让步状语从句或表语从句，常译为“俨然”“仿佛”“好像”“犹如”，都可引导方式状语从句。例如：He closed his eyes as though he were too tired．他闭着眼睛，好像太累了。当从句主语和主句主语一致，从句谓语中又含有动词to be时，可以把主语和to be一起省去。as if在使用时应注意1、当as if引导的从句所表示的内容并不是事实或真实性很小时，一般该从句要用虚拟语气。但如果表示的内容真实性较大，就要用陈述语气。在as if或as though引导的从句中，谓语动词用过去式（be的过去式一般用were，在口语中，主语是一、三人称时也可以用was）表示与现在实事或情况相反的虚拟：用“had+过去分词”表示与过去实事或情况相反的虚拟。2、在非正式文体中，尤其在美国英语中，常用like代替as if。3、as if后有时可直接跟动词不定式（短语）、分词（短语）或介词短语等。这实际上可以看作从句的简略形式。不过，as if后是虚拟语气，还是陈述语气，从字面上不易看出，要根据上下文加以判断。4、as if前可用程度副词加以修饰或加强语气。

Holding his head high, he walked past the pole and the soldiers asif they didn"t exist.as if 与as though 是一组同义词，两者意思相同，用法也相同，只是在口语中人们多半会用as if, 取其简短。as if和as though 用法较为复杂，本文拟对其各种用法做一概述。1．在通常情况下， as if 和as though 所引导的从句的谓语动词多用虚拟语气，表示所叙述的情况与事实相反。具体用法如下：1)谈论现在情形的，用过去时（动词be用were,也可用was）：Why is she looking at me as though she knew me? 他为什么那样看我？像是认识我似的。He behaves as if he owned the house. 他的样子好像他拥有这个房子。 He treats me as if /as though I were a stranger.He speaks as if he were an Englishman.It"s not as though he was /were poor.2)谈论过去情形的动词形式有以下几种：a)过去式，表示过去的状态，如：He looked at me as if I were mad. 他那样看我，好像我是个疯子。He stood there looking at the train and laughing, as if to miss atrain was the best joke in the world.他站在那里，望着火车哈哈大笑，好像误了火车是天底下最开心的事儿似的。 Mr. Coleman always talked as if he knew everything.但是，如果状态动词带有持续时间状语，则用过去完成时：They talked as if they had been friends for years. (高二册，第95页) (试比较：They had been friends for years.)Now it is as though she had known Millie for years. (《现代英语用法词典》) 情态动词亦用过去时：She felt as though she could hardly endure such a life.她觉得简直无法忍受这样的生活。b)过去完成时，表示过去的动作先于主句动词而发生或完成，如： It was as if he had lost his last friend.“I remember,” she tells her children now, “how wild his white hairlooked——as if it had been electrified.”（高二册，第91页）必须注意的时，在指过去的动作时，即使主句是现在时，as if 从句中的动词也要用过去完成时：You look as if you"d seen a ghost. 你好像是见了鬼似的。He talks about Rome as though he had been there himself.他讲起罗马的情况来就好像他亲自到过那里似的。c)过去进行时，表示动作正在进行：He heard a noise, as if someone was breathing.（高一册，第211页） He ran as if ghosts were chasing him.I felt as if the ground were slipping beneath my feet. 我感到大地仿佛在脚下滑动。d)过去将来时，表示将要发生的事态：It looked as if it was going to snow. （高一册，第127页）

as if 是连起来用的，意思是好像， he closes his eyes as if he falls asleep，他闭着眼好像睡着了。

1. CONJYou use if in conditional sentences to introduce the circumstances in which an event or situation might happen, might be happening, or might have happened. (引导条件从句) 如果例：She gets very upset if I exclude her from anything.如果有什么事我将她排除在外，她就会非常难过。例：You can go if you want.如果你想走就走吧。2. CONJYou use if in indirect questions where the answer is either "yes" or "no." (用于间接是非问句中) 是否例：He asked if I had left with you, and I said no.他问我是不是和你一起离开的，我说不是。3. CONJYou use if to suggest that something might be slightly different from what you are stating in the main part of the sentence, for example, that there might be slightly more or less of a particular quality. (表示与主句所述事实可能有少许不同) 即使例：Sometimes that standard is quite difficult, if not impossible, to achieve. 有时那个标准，即使并非不可能，也是很难达到的。4. CONJYou use if, usually with "can," "could," "may," or "might," in a conversation when you are politely trying to make a point, change the subject, or interrupt another speaker. 常与(can)、(could)、(may)、(might)等情态动词连用，表示婉转客气例：If I could just make another small point about the weightlifters in the Olympics. 请允许我就奥运会的举重运动员们再稍说一句。5. CONJYou use if at or near the beginning of a clause when politely asking someone to do something. (用于从句句首或靠近句首的位置，表示礼貌的请求) 是否[礼貌]例：I wonder if you"d be kind enough to give us some information, please? 不知能否请您向我们提供些信息？6. PHRASEYou use if not in front of a word or phrase to indicate that your statement does not apply to that word or phrase, but to something closely related to it that you also mention. 即便不例：She understood his meaning, if not his words, and took his advice. 她即便不懂他的语言，也明白了他的意思，并且接受了他的建议。7. CONJYou use if to introduce a subordinate clause in which you admit a fact that you regard as less important than the statement in the main clause. (引导从句，提出次要的事实) 即使 例：If there was any disappointment it was probably temporary. 即使有任何遗憾，可能也是暂时的。8. PHRASEYou use if ever with past tenses when you are introducing a description of a person or thing, to emphasize how appropriate it is. (与过去式连用，强调对人或事物的描述极为恰当) 如果有…的话[强调]例：I became a distraught, worried mother, a useless role if ever there was one. 如果有个心烦意乱、忧心忡忡的母亲，一个完全无用的角色，那就是我。9. PHRASEYou use if only with past tenses to introduce what you think is a fairly good reason for doing something, although you realize it may not be a very good one. 即使仅仅 (与过去式连用，引出能勉强说明做某事的原因)例：She always writes me once a month, if only to scold me because I haven"t answered her last letter yet. 她总是一个月写一封信给我，即使仅仅是为了责备我还没有回她的上一封信。10. PHRASEYou use if only to express a wish or desire, especially one that cannot be fulfilled. (尤指不能实现的愿望) 要是…多好[情感]例：If only you had told me that some time ago. 要是你之前告诉我那件事该多好。11. PHRASEYou use as if when you are making a judgment about something that you see or notice. Your belief or impression might be correct, or it might be wrong. (表示判断) 好像例：It looked as if she had forgotten how to breathe. 她看上去好像是忘了如何呼吸似的。12. PHRASEYou use as if to describe something or someone by comparing them with another thing or person. (表示类比) 仿佛例：He points two fingers at his head, as if he were holding a gun. 他用两个手指对着自己的脑袋，仿佛正拿着一把枪。13. PHRASEYou use as if to emphasize that something is not true. (强调某事不是真的) 好像…一样[口语]例：Getting my work done! My God! As if it mattered. 把我的活儿干完！我的天哪！好像这很要紧似的。as if 从句的作用1．引导表语从句， 常与as,look, seem,feel,taste,smell,sound等系动词连用。如：She looks as if she were ten years younger． 她看起来好像年轻了十岁。2. 引导方式状语从句，表示“事情是怎么做的”或“一个人或事物是什么样的”。如：如：She loves the boy as if she were his mother． 她爱这男孩，就好像她是他的妈妈一样。3.as if 还可用于省略句中，如果as if 引导的从句是“主语+系动词”结构，可省略主语和系动词，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。如：He acts as if （he were） a fool． 他做事像个傻子。

这两个连词as though和as if没有什么区别。as if用得普遍些，却可引导方式状语从句和表语从句，其从句谓语常用虚拟语气。(1)引导方式状语从句e．g．He closed his eyes as though he were too tired．他闭着眼睛，好像太累了。She acted as though nothing had happened．她装得好像什么事也没发生过似的。当从句主语和主句主语一致，从句谓语中又含有动词to be时，可以把主语和to be一起省去。e．g．He looked about as though (he was)in search of something．他四下张望，好像寻找什么。He paused as if(he was)expecting Tom to speak．他停了下来好像期望Tom说些什么。He listened as though he was turning to stone．这孩子一动不动地听着，仿佛变成了石头似的。(2)引导表语从句e．g．It looks as if it"s going to rain．看样子天要下雨了。It seems as if I"m the first one here．看起来我是第一个到这里的。as though和as if从句用虚拟语气，还是用陈述语气。完全根据具体情况而定。如果从句表示的意思与事实完全相反，或者纯粹是一种假设，通常用虚拟语气。e．g．When a pencil is partly in a glass of water．it looks as if it were broken．当铅笔一部分放进水里，看起来好像折断了似的。(虚拟)You look as if you are friends．你们看起来像朋友似的。

as if虚拟语气用法归纳总结如下：如果从句表示与现在事实相反，谓语动词用一般过去时；从句表示与过去事实相反，谓语动词用“had＋过去分词”；从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。 扩展资料 as if虚拟语气用法归纳总结如下：如果从句表示与现在事实相反，谓语动词用一般过去时；从句表示与过去事实相反，谓语动词用“had＋过去分词”；从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。

as 作为。as if 是短语，意思是彷佛，似乎

意思相近as if 是似乎，好像的意思，作连词用。as 也可以作连词，但意思是因为，由于。as和like都可以作介词，意思是好象。alike只能作表语。1.as 和LIKE 在谈到人，事物或动作彼此有相同点或共同点时 两者皆可LIKE是介词 用于名词和代词之前 Like me, she enjoys all kings of music.他和我一样 各种音乐都喜爱。AS是连词 用于分句之前 如She enjoys all kinds of music,as I do.她各种音乐都喜爱 和我一样在口语中 like 往往用作连词，当作AS 和AS IF 使用 如No nody understands him like/as I do.没有人能象我这样理解他。It looks like / as if he won"t arrive in time.看来他好象不能按时到达了2.比较AS和LIKE 用于职业或作用方面的用法She worked as a teacher for many years.她当了许多年的教师。Our doctor always talks to me like a teacher talking to a child.给我们看病的医生对我说话总是象教师对小学生说话一样。3.as if 是好象、似乎、仿佛的意思4.Alike 是形容词 作表语 相同、一样、相似的意思 The twins don"t look at all alike.这对双胞胎一点都不象也可作副词 表示同样的 The climate here is always hot,summer and winter alike.这里的气候总是那么热，夏季和冬季都一样

1. 在look, seem 等系动词后引导表语从句 It seems as if our team is going to win． 看来我们队要胜了 2.引导方式状语从句 She loves the boy as if she were his mother． 她爱这男孩,就好像她是他的母亲一样

as if,as though:都是“好像,似乎” 的意思. 它们的区别在于： 1.在as if从句中表达与现在事实相反从句用过去时. He felt as if he alone were responsible for what had happened . 他感到仿佛他要独自为所发生的一切负责. 2.在as though从句中,表示过去想象中的动作或情况,从句用过去完成时. The machine operated as though it had been repaired . 这台机器运行起来好像已被修理过似的.

比如说这两个句子： He looked just as he had looked ten years before. 这个句子是陈述语气 他看上去就像他10年前的样子.(说明他像10年前一样年轻) She looked as if she were ten years younger. 这个句子是虚拟语气 他看上去,好象他年轻了10岁,实际上不是这样的.

as if 的用法 一、as if 从句的作用 1． 在look,seem 等系动词后引导表语从句.如：She looks as if she were ten years younger． 她看起来好像年轻了十岁.It seems as if our team is going to win． 看来我们队要胜了.2． 引导方式状语从句.如：She loves the boy as if she were his mother． 她爱这男孩,就好像她是他的母亲一样.The child talked to us as if he were a grownue011up． 那孩子跟我们谈起话来,像个成年人似的.二、as if 还可用于省略句中 如果as if 引导的从句是“主语＋系动词”结构,可省略主语和系动词,这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词.如：He acts as if （he was） a fool． 他做事像个傻子.Tom raised his hands as if （he was going） to say something． 汤姆举起手好像要说什么.She left the room hurriedly as if （she was）angry． 她匆忙离开房间好像生气的样子.三、as if 从句的语气及时态 1． as if 从句用陈述语气的情况.当说话者认为句子所述的是真实的或极有可能发生或存在的事实时.如：It sounds as if it is raining． 听起来像是在下雨.He talks as if he is drunk． 从他谈话的样子来看他是醉了.2． as if 从句用虚拟语气的情况.当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时.从句虚拟语气动词时态的形式如下：（1）如果从句表示与现在事实相反,谓语动词用一般过去时.如：You look as if you didn" t care． 你看上去好像并不在乎.He talks as if he knew where she was． 他说话的样子,好像他知道她在哪里似的.（2）从句表示与过去事实相反,谓语动词用“had＋过去分词”.如：He talks about Rome as if he had been there before． 他说起罗马来好像他以前去过罗马似的.The girl listened as if she had been turned to stone． 那女孩倾听着,一动也不动,像已经变成了石头似的.（3）从句表示与将来事实相反,谓语动词用“would／could／might＋动词原形”.如：He opened his mouth as if he would say something． 他张开嘴好像要说什么.It looks as if it might snow． 看来好像要下雪了.

as +形容词/副词原形+as...是一个表示原级的比较，或者是表示对比。与。。。一样的。。。as if好像...后面的句子往往用虚拟语气。

as if 引导的状语从句一般有以下两种情况：1．引导表语从句;It looks as if they"re looking for something.他们看起来好像在找什么东西。 2. 引导方式状语从句，表示“事情是怎么做的”或“一个人或事物是什么样的”。She spoke to me as if she knew me.她和我说话的神情，好像她早就认识我。

asif引导的状语从句一般有以下两种情况：1．引导表语从句;itlooksasifthey"relookingforsomething.他们看起来好像在找什么东西。2.引导方式状语从句，表示“事情是怎么做的”或“一个人或事物是什么样的”。shespoketomeasifsheknewme.她和我说话的神情，好像她早就认识我。

1．引导表语从句，常与as,look,seem,feel,taste,smell,sound等系动词连用。如：shelooksasifsheweretenyearsyounger．她看起来好像年轻了十岁。2.引导方式状语从句，表示“事情是怎么做的”或“一个人或事物是什么样的”。如：shelovestheboyasifshewerehismother．她爱这男孩，就好像她是他的妈妈一样。

■as if 后面可以接不定式、现在分词、过去分词。但是，这种用法实际上是 u200das if 从句的省略形式。例如：(1) He opened his mouth as if to speak. = He opened his mouth as if he wanted to speak.(2) He shook his head as if to say "no". = He shook his head as if he wanted to say "no". (3) She lifted one arm, as if to shield herself, then screamed in terror. = She lifted one arm, as if she wanted to shield herself, then screamed in terror.■如果 as if 从句的主语和主句的主语一致而且从句的谓语含有 be ，常常可以把从句的主语和 be 一起省略。例如：(1) He stoodas if rooted to the ground. = He stood as if he was rooted to the ground . (2) He paused as if expectingLanny to speak. = He paused as if he was expecting Lanny to speak.

（1）如果从句表示与现在事实相反，谓语动词用一般过去时。如：Youlookasifyoudidn"tcare．你看上去好像并不在乎。Hetalksasifheknewwhereshewas．他说话的样子，好像他知道她在哪里似的。（2）从句表示与过去事实相反，谓语动词用“had＋过去分词”。如：HetalksaboutRomeasifhehadbeentherebefore．他说起罗马来好像他以前去过罗马似的。Thegirllistenedasifshehadbeenturnedtostone．那女孩倾听着，一动也不动，像已经变成了石头似的。这里属于第一种用法

这里又不是as if 的问题. 是后面表达的意思不一样,,写出来当然就不一样.1,好像他是个跑步选手2,好像他在奔跑...

翻译如下 as if：好像， 似乎， 仿佛。用法： 一、as if 从句的作用 1．引导表语从句， 常与as,look, seem,feel,taste,smell,sound等系动词连用。 2、2. 引导方式状语从句，表示“事情是怎么做的”或“一个人或事物是什么样的”。二、as if 还可用于省略句中三、as if 从句的语气及时态例句 1.The house seemed muted, hushed as if it had been deserted. 房子里似乎悄然无声，安静得好像已经没人在住一样。 2.She could hear his ragged breathing, as if he had been running. 她能听到他不均匀的呼吸声，似乎他是跑着过来的。 3.He did not sound as if he believed her. 他听起来似乎并不相信她。 4. I feel as if I should break into song. 我觉得自己应该放声歌唱。 5. It looks as if the pessimists are being proved right. 现在看来似乎悲观论者是正确的。相关词条： 1.if as 如果当 2.look as if 看起来似乎 3.as if with 好象用 4.make as if 假装

似乎 好像 =as though

as if 是“好像”的意思,而if 是"如果“的意思 if一般用于引导条件状语从句

好像的意思虚拟语气并不和用不用as if 有关如果后面跟的情景绝对不可能发生则用虚拟语气，就算前面只有if也是。如if I was a bird

as if 连接的从句,即可表示对现在、将来时间的虚拟,又可以是对过去时间的虚拟。 扩展资料 　　1、基本用法 　　as if 从句用虚拟语气，当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下： 　　1、如果从句表示与现在事实相反，谓语动词用一般过去时。 　　2、从句表示与过去事实相反，谓语动词用“had＋过去分词”。 　　3、从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。例如： 　　You look as if you didn"t care．你看上去好像并不在乎。 　　He talks about Rome as if he had been there before．他说起罗马来好像他以前去过罗马似的。 　　He opened his mouth as if he would say something．他张开嘴好像要说什么。 　　2、两点说明 　　1.从句所表示的内容若为事实或可能为事实，也可用陈述语气。 　　It looks as if we"ll be late.我们似乎要迟到了。 　　This meat tastes as if it has already gone bad.这肉吃起来似乎已经坏了。 　　在现代英语中，有时即使从句内容不是事实，也可用陈述语气。 　　I feel as if I"m floating on air.他感到好像漂浮在空中。 　　The stuffed dog barked as if it is a real one.玩具狗叫起来像真狗。 　　2.注意It isn"t as if的翻译 　　It isn"t as if…是英语中的.固定句式，也可说成 It"s not as though，主要用于表示某个解释不正确，意思是“好像不是”“显然不是”“真不是”等。 　　It isn"t as if he were poor. 他不像穷的样子（他又不穷）。 　　It isn"t as if he didn"t recognize me! He just walked straight past me as I stood there. 他不像是没认出我！可是我站在那里他迳直从我跟前走过。 　　3、as if 从句的作用 　　1.在look，seem等系动词后引导表语从句。 　　She looks as if she were ten years younger. 　　她看起来好像年轻了十岁。 　　2.引导方式状语从句 　　She loves the boy as if he were he father. 　　她爱这个男孩，就好像他是她的父亲一样。 　　4、as if还可用于省略句 　　如果as if引导的从句是“主语+系动词”结构，可省略主语和系动词，这样as if后就只剩下名词、不定式、形容词（短语）、介词短语或分词。 　　He acts as if (he were)a fool. 　　他做事像个傻子。 　　She left the room hurriedly as if (she were)angry. 　　她匆忙离开房间好像生气的样子。

as if,as though的用法：这两个复合从属连词的用法和意义完全一样,但as if 在当代英语中比 as though 普通得多.as if 引出的方式状语从句所表示的情况是事实或具有很大可能性时,通常用直陈语气.名子的谓语我为look,seem,taste,smell,sound等.如：It looks as if they have succeeded in the experiment.看来好像他们试验成功了.as if 引出的方式状语从句所表示的情况不是事实,而是主观想象或夸大性的比喻时,通常用虚拟语气.从句中谓语动词一般用过去时,be 动词常用 were,但在现代英语中也常见到单数 was的情况.如：The young man with long hair looks as if he were a girl.这位满头长发的男青年看上去像个女的.The injured man acted as if nothing had happened to him.这位受伤的男子表现得好像没发生什么事一样.as if 引出的方式状语从句,当主句谓语是过去时态时,从句谓语形式常常没有什么特殊之处.如：The lady felt as if she lost something.这位女士好像学得丢了什么东西.He was singing as though / if he hadn"t had / didn"t have a care in the world.他唱着歌,好像人世间他没有忧虑.as if 引导的同一从句中所用的时态不同,意思往往不同.请比较：The clown looks as if he were ill.那个小丑好像害病似的.（虚拟语气）The clown looked as if he had been ill.那个小丑过去好像生过病.（过去生过病或虚拟语气）希望对你有帮助

as if 用法如下：as if 从句用虚拟语气，当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下：as if的用法在look, seem 等系动词后引导表语从句It seems as if our team is going to win．看来我们队要胜了引导方式状语从句She loves the boy as if she were his mother．她爱这男孩，就好像她是他的母亲一样。1、如果从句表示与现在事实相反，谓语动词用一般过去时。2、从句表示与过去事实相反，谓语动词用“had＋过去分词”。3、从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。例如：You look as if you didn"t care．你看上去好像并不在乎。扩展资料：注意事项：1、从句所表示的内容若为事实或可能为事实，也可用陈述语气。It looks as if we"ll be late.我们似乎要迟到了。2、在现代英语中，有时即使从句内容不是事实，也可用陈述语气。I feel as if I"m floating on air.他感到好像漂浮在空中。

一、as if 从句的作用 1． 在look, seem 等系动词后引导表语从句。 如： She looks as if she were ten years younger． 她看起来好像年轻了十岁。 It seems as if our team is going to win． 看来我们队要胜了。 2． 引导方式状语从句。 如： She loves the boy as if she were his mother． 她爱这男孩，就好像她是他的母亲一样。 The child talked to us as if he were a grownup． 那孩子跟我们谈起话来，像个成年人似的。 二、as if 还可用于省略句中如果as if 引导的从句是“主语＋系动词”结构，可省略主语和系动词，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。 如： He acts as if （he was） a fool． 他做事像个傻子。 Tom raised his hands as if （he was going） to say something． 汤姆举起手好像要说什么。 She left the room hurriedly as if （she was）angry． 她匆忙离开房间好像生气的样子。 三、as if 从句的语气及时态 1． as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生或存在的事实时。 如： It sounds as if it is raining． 听起来像是在下雨。 He talks as if he is drunk． 从他谈话的样子来看他是醉了。 2．as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下： （1）如果从句表示与现在事实相反，谓语动词用一般过去时。 如： You look as if you didn" t care． 你看上去好像并不在乎。 He talks as if he knew where she was． 他说话的样子，好像他知道她在哪里似的。 （2）从句表示与过去事实相反，谓语动词用“had＋过去分词”。 如：He talks about Rome as if he had been there before． 他说起罗马来好像他以前去过罗马似的。 The girl listened as if she had been turned to stone． 那女孩倾听着，一动也不动，像已经变成了石头似的。 （3）从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。 如： He opened his mouth as if he would say something． 他张开嘴好像要说什么。 It looks as if it might snow． 看来好像要下雪了。 (4)as if 后面可以接陈述语气和虚拟语气，如果句子的情况是真实的，那么只要保持时态一致即可，如果后面接的并非真实情况，则要按照虚拟语气规则把句子形式改变（简单说就是事态倒退原则）。 举例： it seems as if it is raining。外面看起来象是下雨了。（陈述） it seems as it it were raining。外面看起来好像下雨一样。（虚拟，其实并没有下雨）

一、文法不同　as if 引导的方式状语从句或表语从句，用虚拟语气。例句：　He acts as if he knew me. 他显得认识我似的。as though 表示与现在事实相反，谓语动词，用would (might, could)+动词原形。例句：They treat me as though I were a stranger. 他们待我如陌生人。二、时态不同as if 表示与过去事实相反，用过去完成时。例句：This meat tastes as if it has already gone bad. 这肉吃起来似乎已经坏了。as though 表示将来的可能性不大，用一般过去时。例句：I feel as though I"m floating on air. 他感到好像漂浮在空中。三、语境不同as if 用来描述比较悲惨的境遇或者状况。例句：It is not as if he were poor. 他不像穷的样子(或他又不穷)。as though 语境属于中性，可以用到很多情境中。例句：It is not as though you were going away for good. 又不是你离开不回来了。

以as if (as though)引导的方式状语从句或表语从句，有时用虚拟语气，若表示与现在事实相反，谓语动词用一般过去时；若表示与过去事实相反，用过去完成时；表示将来的可能性不大，用would (might, could)+动词原形。如：I love you as if you were my son. 我爱你就像你是我的儿子。注：若从句所内容可能为事实，也可用陈述语气。如：t seems as if we shall have to walk. 似乎我们得步行了。主要看结构的表达方式！

一、文法不同　as if 引导的方式状语从句或表语从句，用虚拟语气。例句：　He acts as if he knew me. 他显得认识我似的。as though 表示与现在事实相反，谓语动词，用would (might, could)+动词原形。例句：They treat me as though I were a stranger. 他们待我如陌生人。二、时态不同as if 表示与过去事实相反，用过去完成时。例句：This meat tastes as if it has already gone bad. 这肉吃起来似乎已经坏了。as though 表示将来的可能性不大，用一般过去时。例句：I feel as though I"m floating on air. 他感到好像漂浮在空中。三、语境不同as if 用来描述比较悲惨的境遇或者状况。例句：It is not as if he were poor. 他不像穷的样子(或他又不穷)。as though 语境属于中性，可以用到很多情境中。

as if,as though的用法：这两个复合从属连词的用法和意义完全一样,但as if 在当代英语中比 as though 普通得多.as if 引出的方式状语从句所表示的情况是事实或具有很大可能性时,通常用直陈语气.名子的谓语我为look,seem,taste,smell,sound等.如：It looks as if they have succeeded in the experiment.看来好像他们试验成功了.as if 引出的方式状语从句所表示的情况不是事实,而是主观想象或夸大性的比喻时,通常用虚拟语气.从句中谓语动词一般用过去时,be 动词常用 were,但在现代英语中也常见到单数 was的情况.如：The young man with long hair looks as if he were a girl.这位满头长发的男青年看上去像个女的.The injured man acted as if nothing had happened to him.这位受伤的男子表现得好像没发生什么事一样.as if 引出的方式状语从句,当主句谓语是过去时态时,从句谓语形式常常没有什么特殊之处.如：The lady felt as if she lost something.这位女士好像学得丢了什么东西.He was singing as though / if he hadn"t had / didn"t have a care in the world.他唱着歌,好像人世间他没有忧虑.as if 引导的同一从句中所用的时态不同,意思往往不同.请比较：The clown looks as if he were ill.那个小丑好像害病似的.（虚拟语气）The clown looked as if he had been ill.那个小丑过去好像生过病.（过去生过病或虚拟语气）希望对你有帮助

as if的用法如下：as if从句用虚拟语气，当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式：如果从句表示与现在事实相反，谓语动词用一般过去时。从句表示与过去事实相反，谓语动词用“had＋过去分词”。从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。as if的例句如下：1、Why is she looking at me as though she knew me? 他为什么那样看我？像是认识我似的。2、He behaves as if he owned the house. 他的样子好像他拥有这个房子。3、He stood there looking at the train and laughing, as if to miss a train was the best joke in the world.他站在那里，望着火车哈哈大笑，好像误了火车是天底下最开心的事儿似的。4、He talks about Rome as though he had been there himself.他讲起罗马的情况来就好像他亲自到过那里似的。5、I felt as if the ground were slipping beneath my feet. 我感到大地仿佛在脚下滑动。6、There"s Hob, talking to the ticket-collector. It looks as if he hasn"t got a platform ticket. 那不，霍布正在同检票员说话，看样子还没弄到站台票。

这两个连词as though和as if没有什么区别。as if用得普遍些，却可引导方式状语从句和表语从句，其从句谓语常用虚拟语气。(1)引导方式状语从句e．g．He closed his eyes as though he were too tired．他闭着眼睛，好像太累了。She acted as though nothing had happened．她装得好像什么事也没发生过似的。当从句主语和主句主语一致，从句谓语中又含有动词to be时，可以把主语和to be一起省去。e．g．He looked about as though (he was)in search of something．他四下张望，好像寻找什么。He paused as if(he was)expecting Tom to speak．他停了下来好像期望Tom说些什么。He listened as though he was turning to stone．这孩子一动不动地听着，仿佛变成了石头似的。(2)引导表语从句e．g．It looks as if it"s going to rain．看样子天要下雨了。It seems as if I"m the first one here．看起来我是第一个到这里的。as though和as if从句用虚拟语气，还是用陈述语气。完全根据具体情况而定。如果从句表示的意思与事实完全相反，或者纯粹是一种假设，通常用虚拟语气。e．g．When a pencil is partly in a glass of water．it looks as if it were broken．当铅笔一部分放进水里，看起来好像折断了似的。(虚拟)You look as if you are friends．你们看起来像朋友似的。

as if后面要加虚拟语态

一、as if 从句的作用 　　1． 在look, seem 等系动词后引导表语从句。 　　如：She looks as if she were ten years younger． 　　她看起来好像年轻了十岁。 　　 　　2． 引导方式状语从句。 　　如：She loves the boy as if he were her father． 　　她爱这男孩，就好像他是她的父亲一样。 　　 二、as if 还可用于省略句中如果as if 引导的从句是“主语+系动词”结构，可省略主语和系动词，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。 　　如：He acts as if （he were） a fool． 　　他做事像个傻子。 　　 　　She left the room hurriedly as if （she were）angry． 　　她匆忙离开房间好像生气的样子。 　　三、as if 从句的语气及时态 　　1． as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生或存在的事实时。 　　如： It sounds as if it is raining． 　　听起来像是在下雨。 　　He talks as if he is drunk． 　从他谈话的样子来看他是醉了。 　　2．as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下： 　　（1）如果从句表示与现在事实相反，谓语动词用一般过去时。 　　如： You look as if you didn" t care． 　　你看上去好像并不在乎。 　　（2）从句表示与过去事实相反，谓语动词用“had+过去分词”。 　　如：He talks about Rome as if he had been there before． 　　他说起罗马来好像他以前去过罗马似的。 　　（3）从句表示与将来事实相反，谓语动词用“would/could/might+动词原形”。 　　如： He opened his mouth as if he would say something． 　　他张开嘴好像要说什么。 　　It looks as if it might snow． 看来好像要下雪了。 　　(4)as if 后面可以接陈述语气和虚拟语气，如果句子的情况是真实的，那么只要保持时态一致即可，如果后面接的并非真实情况，则要按照虚拟语气规则把句子形式改变（简单说就是时态倒退原则）。 　　(5) as if 在俚语中能表示反讽，功能类似"like"，举例：As if / Like you are going to do the dishes；"like"不能独立成句，但as if 能（完整句子为：as if that/it is true.），例子：甲：She said she would help me with the project. 乙：As if！

as if 的用法 一、as if 从句的作用 1． 在look,seem 等系动词后引导表语从句. 如： She looks as if she were ten years younger． 她看起来好像年轻了十岁. It seems as if our team is going to win． 看来我们队要胜了. 2． 引导方式状语从句. 如： She loves the boy as if she were his mother． 她爱这男孩,就好像她是他的母亲一样. The child talked to us as if he were a grown?up． 那孩子跟我们谈起话来,像个成年人似的. 二、as if 还可用于省略句中如果as if 引导的从句是“主语＋系动词”结构,可省略主语和系动词,这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词. 如： He acts as if （he was） a fool． 他做事像个傻子. Tom raised his hands as if （he was going） to say something． 汤姆举起手好像要说什么. She left the room hurriedly as if （she was）angry． 她匆忙离开房间好像生气的样子. 三、as if 从句的语气及时态 1． as if 从句用陈述语气的情况.当说话者认为句子所述的是真实的或极有可能发生或存在的事实时. 如： It sounds as if it is raining． 听起来像是在下雨. He talks as if he is drunk． 从他谈话的样子来看他是醉了. 2．as if 从句用虚拟语气的情况.当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时.从句虚拟语气动词时态的形式如下： （1）如果从句表示与现在事实相反,谓语动词用一般过去时. 如： You look as if you didn" t care． 你看上去好像并不在乎. He talks as if he knew where she was． 他说话的样子,好像他知道她在哪里似的. （2）从句表示与过去事实相反,谓语动词用“had＋过去分词”. 如： He talks about Rome as if he had been there before． 他说起罗马来好像他以前去过罗马似的. The girl listened as if she had been turned to stone． 那女孩倾听着,一动也不动,像已经变成了石头似的. （3）从句表示与将来事实相反,谓语动词用“would／could／might＋动词原形”. 如： He opened his mouth as if he would say something． 他张开嘴好像要说什么. It looks as if it might snow． 看来好像要下雪了. (4)as if 后面可以接陈述语气和虚拟语气,如果句子的情况是真实的,那么只要保持时态一致即可,如果后面接的并非真实情况,则要按照虚拟语气规则把句子形式改变（简单说就是事态倒退原则）. 举例： it seems as if it is raining.外面看起来象是下雨了.（陈述） it seems as it it were raining.外面看起来好像下雨一样.（虚拟,其实并没有下雨）,2,从句,2,

就是从句的作用

没区别，as if与as though是一组同义词，两者意思相同，用法也相同。as if = as though，常用来引导一个让步状语从句或表语从句，常译为“俨然”“仿佛”“好像”“犹如”，都可引导方式状语从句。例如：He closed his eyes as though he were too tired．他闭着眼睛，好像太累了。当从句主语和主句主语一致，从句谓语中又含有动词to be时，可以把主语和to be一起省去。as if在使用时应注意1、当as if引导的从句所表示的内容并不是事实或真实性很小时，一般该从句要用虚拟语气。但如果表示的内容真实性较大，就要用陈述语气。在as if或as though引导的从句中，谓语动词用过去式（be的过去式一般用were，在口语中，主语是一、三人称时也可以用was）表示与现在实事或情况相反的虚拟：用“had+过去分词”表示与过去实事或情况相反的虚拟。2、在非正式文体中，尤其在美国英语中，常用like代替as if。3、as if后有时可直接跟动词不定式（短语）、分词（短语）或介词短语等。这实际上可以看作从句的简略形式。不过，as if后是虚拟语气，还是陈述语气，从字面上不易看出，要根据上下文加以判断。4、as if前可用程度副词加以修饰或加强语气。

as if和as though区别：as if引导的方式状语从句或表语从句，用虚拟语气。而as though表示与现在事实相反，谓语动词，用would (might,could)+动词原形

as if 从句用虚拟语气，当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下：1、如果从句表示与现在事实相反，谓语动词用一般过去时。2、从句表示与过去事实相反，谓语动词用“had＋过去分词”。3、从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。例如：You look as if you didn"t care．你看上去好像并不在乎。He talks about Rome as if he had been there before．他说起罗马来好像他以前去过罗马似的。He opened his mouth as if he would say something．他张开嘴好像要说什么。as if 从句的作用：1、在look，seem等系动词后引导表语从句。She looks as if she were ten years younger.她看起来好像年轻了十岁。2、引导方式状语从句She loves the boy as if he were he father.她爱这个男孩，就好像他是她的父亲一样。