enough to和too to的用法及区别

在一般情况下,too...to...结构意为“太……以致不能……”,too后接形容词或副词,to是动词不定式符号,后接动词原形,动词不定式表示否定意义.但是,too...to...结构在以下情况中,动词不定式表示肯定意义.
一、too...to ...的意义
too...to...句型形式是肯定的,但表达否定意义,表示"太……而不能……".too的后面接形容词或副词的原级,to的后面接动词原形,构成动词不定式.too...to...句型是简单句.例如：
He is too young to join the army.他年龄太小,不能参军.
二、动词不定式的逻辑主语
动词不定式所发出的动作,其执行者与整个句子的主语不同指一个人或物时,需要在动词不定式前加上一个逻辑主语(for sb.).例如：
The maths problem is too difficult for me to work out.这道数学题太难我不能解出它.
三、too...to...结构表示肯定意义的情况
1.too前面含有表示否定意义的词,例如:not,never,nothing等时,too...to...结构不表示否定意义.例如：
One is never too old to learn.活到老,学到老.
2.如果在too...to...结构的前面出现了only,不仅免去了其否定意义,反而加强了它的肯定语气,only too相当于very或very much.例如：
I shall be only too pleased to get home.我将极高兴地回家.
3.too后为表示情感的形容词,例如：glad,pleased,happy,sad等时,表示的是肯定意义.例如：
He is too sad to hear the bad news.听到不幸的消息他太悲伤了.
四、too...to...结构与...enough to...结构及so...that...结构的相互转换
1.将too...to...结构转换为...enough to...结构时要注意：①enough前的形容词或副词须是too前面形容词或副词的反义词；②...enough to ...句式须用否定式；③too...to...结构有逻辑主语时,...enough to...结构也要加上逻辑主语.例如：
She is too young to do the work.→She isn't old enough to do the work.
2.将too...to...结构转换为so...that...结构时要注意：①so...that...结构是复合句,so的后面接形容词或副词,that的后面接从句；②that后面的从句要用否定形式.例如：
She is too young to do the work.→She is so young that she can't do the work.
.

例如：
She is too young to do the work.→She isn't old enough to do the work.
2.将too...to...结构转换为so...that...结构时要注意：①so...that...结构是复合句,so的后面接形容词或副词,that的后面接从句；②that后面的从句要用否定形式.例如：
She is too young to do the work.→She is so young that she can't do the work.毕竟我才上初三、只能尽力而为.补充：lz翻译不对,应为：he goes out of his way to help her./he racks his mind to help her.He is only too pleased to help her转换：he is afraid that he can't help her enough.he is so pleased that he can't help her enough.追问：你们初二时老师讲了too to可以表肯定吗 回答：下面几种情况“too...to...”表示肯定意义.1.当too后面接anxious,eager,ready等一类形容词时,“too… to…”结构表肯定意义 ：
Jenny is too ready to speak.Jenny话太多了.
I am too anxious to know the test result.我太想知道考试结果了!
2.当too前面有用于加强语气的only,all,but等词时,“too… to…”结构表肯定意义.
I am only too glad to meet you.见到你真是太高兴了.
You know but too well to hold your tongue.你深知保持沉默的妙处.
3.当too前面有not或never时,“too… to…”结构表肯定意义：（有人认为这是双重否定表示肯定）
One is never too old to learn.
It is not/never too late to mend.追问：初二老师讲的还是你自学的?还是初三讲的?回答：那个sb老师才大学毕业,怎么可能将这么详细.这是从网上找到的,不过我父母都是英语老师,问他们比较容易些.还有,我是该上初三,追问：我知道 too to 表肯定意义的用法,只是想知道表肯定时,能不能与so that,enough to的肯定式 转换 回答：有时可以,不过肯定的是,so...that..可以和.enough to进行转换.追问：你初二上学期老师详细教become,turn,grow的区别了吗?when引导的时间状语从句了吗?回答：我妈给我讲过,when引导的时间状语从句后面不能加将来时,用一般现在时表一般将来时,用一般过去时表过去将来时、grow 主要表示逐渐变化,强调变化的过程,
例：It began to grow dark.天色渐渐黑了.grow表示“逐渐变成新的状态”的含义.如：
My younger brother is growing tall．我的弟弟渐渐长高了.become通常不用来表示未来的事,而表示变化过程已经完成,用法比较正式.如：I became ill．我病倒了.turn有“成为与以前完全不同的东西”的含义.如：
The milk turned sour．牛奶变酸了.

Do you used to do something enough to pass the exam

前者为……足够能……
后者为太……而不能…….

Jack is well enough to go to school.
不明白的再问哟,请及时采纳,多谢 !

答案选择A.look after 照顾,照料
句子的意思是你不需要担心我,我足以照顾我自己.

1.he is too young to study.
he is not old enough to study.
2.the apple is too green to eat.
the apple is not ripe enough to eat.
3.it is too late to start.
it is not early enough to start.
4.i am too nervous to run.
i am not brave enough to run.
5.the shirt is too short to wear.
the shirt is not long enough to wear.

C.
make sb +形容词,意思是“是某人……”.这里的意思是使她开心.happily是副词,TO后面跟动词原形,所以选择C

What surprised us the most is his ability that he's skilled enough to handle such a tricky problem independently.

①There is a mango for you.
②I was late enough to catch the last bus.
③She is my tight friends ,she can share happiness and sadness with me.

这道题对我来说很容易回答
This question is easy enough for me to answer.
如果答案对亲有所帮助请采纳予以鼓励!

举些句型转换的例句给楼主看看：
He is too young to go to school.他太年幼了以至于不能上学.
= He isn't old enough to go to school.他的年纪还没有大到足以上学.
= He is so young that he can't go to school.他是如此的年幼,以至于他不能上学.

We are not strong enough to open the doo

1 He was too surprised to say a word.
He was so surprised that he couldn't say a word.
2 They were too frightened to find their way out.
They were so frightened that they couldn't find their way out.
3 The teacher spoke loudly enough to be heard by us clearly.
4 The room is too small to live in.
The room is not big enough to live in.
The room is so small that we four can't live in it.
5 The bus was to full to get on.
The bus was not empty enough to get on.
The bus was so full that she couldn't get on.

They are such careless people that (they) may cause a fire.（前后主语一直,后者主语可省略）
The big stone is rolling so fast that the man may get injured.
I was too afraid to move.
Peter is only four years old.He is too young to go out by himself.（four years old前面加了only,想表达的就是young）
My grandmother is so deaf that she doesn't hear what people say.


so...that和such...that的区别在于前者修饰的是形容词,后者修饰的是名词
too...to...翻译成“太.以至于.”,一般用在否定意义的句子里
enough to 意思和too...to...差不多,但多用于肯定意义的句子里

I (don't) think it is (creative / innovative) enough to ( go for a picnic on weekends).
仅供参考,欢迎交流

我给你个公式吧,虽然我知道学习语言不应该这样,但是作为初学是有帮助的.
so XXX that XXX的意思就是“如此XXX以至于XXX”
比如： I'm so tired that I don't want to go to the party this evening.
我今天（如此地）累,以至于我不想去晚上的聚会了.
too XXX to XXX的意思就是“太XXX了,以至于不能XXX了”
比如：I'm too tired to go to the party this evening.
我今天太累了,不能去玩上的聚会了.
至于你说的“enough to”.我要告诉你没有这么个特别的词组.enough的意思就是“足够（的）”
这些能帮你吗?