have to现在完成时是have,had to吗?

must表示主观,have to表示客观.
We must help each other.
My sister is ill,my mother has to look after her.
must的用法
1）表示主观的义务和必要,主要用于肯定句和疑问句,意思为“必须……,得……,要……”；由must引起的疑问句,肯定回答要用must或haveto,否定回答要用needn’t或don’thaveto,意思是“不必”；must的否定形式mustn’t表示禁止,意思是“不能,不许”.
We must find a good method to learn computer well.
我们必须找一个学好电脑的方法.
2）表示肯定的猜测,常用于肯定句中,意思为“一定是,必然……”.
注意must表示推断或猜测的几种情况:
Your sister must be a doctor in this hospital.（现在的猜测）
你姐姐一定是这家医院的医生.
have to/have got to的用法
1）must表示一种主观的需要,而have to表示一种客观的需要,意思是“不得不”.如：
I have to attend an important meeting this afternoon.
今天下午我不得不参加一个重要的会议.
Mother is out,so I have to look after the shop.
妈妈不在家,因此我不得不照看商店.
2）have to的否定形式是don’t have to,相当于needn’t.如：
They don’t have to buy a computer at present.
他们目前没有必要买电脑.
3）have to与have got to常可以互换.

1.I_am afraid of_the sea.I don,t know how to swim.2.Don,t_worry about_things so much .It will make yuo stressed out .3.Sorry ,I can,t join you.I_have to_study for a test .4.I really _miss__my friend Tina .She moved to another town.5.I__used to__have short hair but now I grow it long.

当然是实意动词了.
如果也可以做助动词的话,其否定句也可以是haven't to,但是它正确的否定形式是：don't have to..所以肯定是实意动词了.

have to可以代替must,表示“必须”、“不得不”,并可以补充must所缺的时态.should和ought to都表示“宜于”,should一般表示“在我看来这是可取的”或“这是（你）应该做的事”,ought to必should语气略强,有时表示来自外界的规则或义务,但疑问句和否定句结构则多用should.should have和ought to have后面跟过去分词,表示“本应当做的或必须做的事并没有做”,因此后面可接but I wasn't/I didn't.

是的

1,must2,have to3,have to4,have to5,must.
have to是不是必须,不愿做也得做
而must是自己心里想的,自己让自己做?must表示主观,have to表示客观.
We must help each other.
My sister is ill,my mother has to look after her
英译汉自己练着做吧

have to后接动词原形,(即have to do sth),当人称是三单时,have变为has

1 should(ought to) come
2 had to do
3 should have come
4 shoukd have asked
5 had to explain

1. must2. might/may3. had to4. should5. can't; have to6. mustn't 7. needn't; can8. can

动词原形,表示由于客观原因,不得不做某事

有一点区别的~
have to有“不得不”的意思,must就是必须的意思~

C
one
有不会的可以再问我

D
因为have to中的have可以变化为had,has,故能够用于比must更多的时态里

不是介词,是不定式.
LISTEN TO 的TO是介词

have to所在的句子在进行句型转换时要借助于助动词 do ,does ,did .
例如：
I have to sweep the floor.
---I don't have to sweep the floor.
She has to finish her homework .
---Does she have to finish her homework
They had to water the flowers.
---Did they have to water the flowers?

we have to start the song

has to
don't have to
have to
doesn't have to

have是助动词,have单用是指拥有的意思,若后带动词就要跟动词过去分词,是用于现在完成时.而have to是情态动词,是不得不的意思,后带动词原形

The table has to be taken by him!
have to be
例子：i have to be a superman!我要成为一个超人!

要.
是的.

must

have to 表示客观的需要
eg. Tom,come out to play with us.
Sorry, my mom said i have to finish my homework first.
eg. Do you have to leave now?
yes, i must
eg Do i have to eat it up,mom?
no, you needn't
参考资料：自己的回答和Dr.eye译典通字典

must 是必须做
have to是不得不做,带有一种主观的不愿意
must not是禁止
can not是不能,强调超过能力所及的范围

Find out 找出,cut down砍断 ,have to必须 ,from outside to inside 从外到内,go back回去 ,faraway 遥远的,make fire 生火,to one’s surpise 让某人惊奇的是,at least 至少,all of a sudden 突然,get caught in th...

I have to take care of my little sister today because my parents will visit their friend.
I have to do my homework carefully because my mom is so angry now.
I heard a big voice when I have to go out.
He can't walk since now.
She can't go out to play because of cold weather.
I can't tolerate the hard training.

可以啊.

不是复合词,复合词指的是将两个不同的单词拼在一起有里新的意思,比较常见的像：biochemistry生化学 至于不是一个词的情态动词也有但不多,我知道的只有have to 和ought to（应该去做……）希望对你有帮助

He has to read books
She has to go swimming
He has to listen to music
I have to learn new lessons
I have to play the piano
I have to help with the housework

have/has to 永远跟的是原型!

老师说的应该是had better 吧?
最好是...的意思
eg: you had better call him
have to 是不得不的意思

The customer is lucky because he does not have to pay for the shopping.

不一样.can't fail to 是不能失败,要做就要成功.
have to 是不得不,没有选择.只能去做.

have 有 i have sth
have to 不得不.i have to do sth=i must do sth

能用于现在完成时

要的 has to

have to 的否定是don't have to 或者 needn't
你可以根据这个来做回答

have to 不得不
hear the news 听新闻
move to Canada 搬到加拿大

不该,也不用改．
第二个可以改,因为有”不得不”的意思．（不改也行．）
一,三都不改,因为没有这层意思．而是我们要这么做．
要长时间的积累,不然你就要仔细体会,哪些是主动做的,哪些是不得不做的．
今天的答案可以告诉你,但当场用的就没人帮你了．
慢慢来吧．

should表示“按道理应该”
must表示“主观上必须”
eg:We must clean the classroom because we should keep it clean.
need to“有必要做”
have to表示“客观上不得不”
eg:We have to clean the classroom because it is too dirty.
ought to表示“主观上应该”

固定词组 ph.
1.
必须
have to
1.
必须,不得不
Have to
1.
必须,不得不,如
have to 译为 不得不、必须

have got to = have to
都是“不得不(做某事)"的意思
如:I have got to leave=I have to leave.
我不得不离开.

I have to ask my parents first.
I had to go.
You will have to sign a paper.
You had better tell him the truth instead of lying to him.
I had better do my assignment instead of hanging out with you.
She had better wear an old dress instead of wearing that new but wierd one.

have to不是情态动词,而是词组,不得不的意思

答案：We have to stay there for two hours.

I have to clean our classroom again.

have to意思比较强硬,表示必须做的.
need to表示需要做的,但是不一定必须

应该是
has to
我妈妈不得不在农场工作.
主语三单,一般现在时,所以必须用has
如果用完成时,后面动词work为过去分词才行,所以只能是has to
~~~~~~~~~~～～~~~~祝你进步,如对你有帮助,请及时采纳~~~~~~~~~~~~~~~~~~

have to某种程度上等于must.是情态动词.但是,光是have本身,是普通动词.

She looks as pretty as before.她看起来和以前一样漂亮.
I have to look after her at home.我必须在家照顾她
Bring it nearer so that I may see it better．拿近一些,好让我看得更清楚些.
Jokes are able to make people happy.笑话能让人快乐~
I spent two hours on this maths problem.这道数学题花了我两个小时.
It took them three years to build this road.他们用了三年时间修完了这条路.
The car cost him around ten thousand US dollars.这车花去他一万美元左右.

1）must和 have to的区别
1 含义不同
must 和 have to做情态动词用时,意思很接近,但含义有所不同.must 表示必须,通常着重于说话者的主观看法,认为有义务,有必要去做某事.have to着重于表示客观的需要,含有“不得不”的意思.
例如：You must be back by 3 p.m 你必须三点以前回来（表示命令）
You have to be back by 3 p.m（客观需要）
2 形式不同
从形式上看must 只有一种形式,可用于现在时,过去时（多用于间接引语中）.而have to却有4种形式,即:have to,had to,will/shall have ,would/should have to,可用于现在时,过去时,将来时和过去将来时.
例如：He said he would have to (must)get his entry visa for Japan 他说他得办理去日本的入境签证
She had to return before Sunday她得在周日以前回来.
2）
not …… till意为“直到……才”,主句常用终止性动词（即非延续性）,表示until /till所表示的时间一到,该动作就发生.如：
He didn”t go to bed until / till eleven last night.
昨天夜里他直到十一点才上床睡觉.
She didn”t know me until / till last week.
她直到上一周才认识我.
Einstein was not able to return to his homeland until the war was over.
直到战争结束后爱因斯坦才得以回国.
3）
when和while引导的时间状语从句与这一时态连用.所以区别when和while的用法成了这一单元的难点.（一）、when,while都有“当……时候”的意思.when既可表示某一点时间,也可以表示某一段时间 .在when引导的时间状语从句中,其谓语动词可以是延续性的,也可以是非延续性的,可与主句中的谓语动词同时发生,也可在其后发生.例如：1、I was just reading a book when she came into my room.她走进我房间时,我正在看书.2、Were you writing when the teacher came in?老师进来的时候,你在写信吗?3、When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想.（二）、while只能表示某一段时间,不能表示某一点时间.在while引导的时间状语从句中,其谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在.例如：1、While Jim was mending his bike,Lin Tao came to see him.正当吉姆修自行车时,林涛来看他.2、You can’t do your homework while you’re watching TV.你不能一边看电视一边做家庭作业.（三）、另外,when和while的区别还在于：while引导的时间状语从句多用进行时态,而when引导的时间状语从句多用一般时态.例如：1、While they were talking ,the bell rang.正在他们谈话的时候,上课铃响了.2、I was doing my homework when my mother came back home yesterday evening.昨天晚上妈妈回家的时候,我正在做家庭作
4）
go through
1.经历
The country has gone through too many wars.
这个国家经历了太多的战争.
2.被通过
The new law did not go through.
新法案未能通过.
3.讨论
Let's go through the argument again.
让我们再来讨论一下这一论点.
4.举行
They went through the marriage service.
他们举行了婚礼.
go across:
vt.渡过(越过)
We can go across the freeze river.
我们可以横过这冻结了的大河.
We can go across the frozen river.
我们可以横过这冻结了的大河.
Did your speech go across to the crowd all right?
你的演讲群众理解了吗?
The commander ordered that the troops go across the river immediately.
指挥员命令部队立刻过河.
The road go straight across the plain for two hundred kilometres.
这条路笔直地穿过平原,长达200公里.