英语学习:情态动词之must的用法详解【多篇】范文

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英语学习:情态动词之must的用法详解【多篇】

不能用被动语态的情况 篇一

不能用被动语态的情况

1、there be 结构及所有的不及物动词或词组充当谓语时,无被动语态。

2、系动词无被动语态。

3、一些表示状态的及物动词,如cost, have, own, possess等不能用被动语态。

4、表示“希望、意图www.haoword.com”的动词,如wish, want, hope, like, love,hate等不能变被动语态。

5、当及物动词leave, enter, reach等的宾语是表示地点和处所(包括组织、团体、军队、国家等)的名词时,不可变为被动语态。

must用法详解相关文章:

must和have to的用法区别到底在哪里?你“必须”知道! 篇二

★ must表示主观上认为有义务或有责任必须做某事,强调说话人的主观看法;

have to表示由于客观因素而不得不做某事,强调客观需要。如:

Everyone must obey the traffic rules.每个人都必须遵守交通规则。Alice’s home is very far from her school, so she has to have lunch atschool.爱丽丝的家离学校很远,所以她不得不在学校吃午饭。

★must没有数和时态的变化,后接动词原形;

have to有人称、数和时态的变化,其第三人称单数形式为hasto,其一般过去式为hadto。如:

You must say no to smoking and drinking.你必须戒掉烟酒。I shall have to leave London tomorrow.我明天得离开伦敦。

★在否定句中,mustn’t表示“不许,禁止”;

don’t/doesn’t/didn’thave to表示“不必,无须”,相当于needn’t。如:

Look at the sign. You mustn’t park here.看那个标志,这里禁止停车。We don’t have to/needn’t go to school on Sundays.周日我们不必去上学。

★含有must的一般疑问句,其肯定回答用must,否定回答用needn’t或don’thave to;

回答含有have to的一般疑问句时,要用do的适当形式。如:

— Must I come back before 9 o’clock?我必须在九点以前回来吗?— Yes, you must. / No, you don’t have to/needn’t.是的,你必须。/不,你不必。— Does she have to stay at home on Sunday?她星期天必须呆在家里吗?— Yes, she does. / No, she doesn’t.是的,她必须(呆在家里)。/不,她不必(呆在家里)。

学以致用

A. 用must或have to的适当形式填空。1. We wait half an hour for a buslast Sunday.2. This is a public place. You smoke here.3. To catch the first bus, we get up early tomorrow.

B. 按要求完成下列各题,每空一词。4. — Must I go home at once? (作否定回答) — No,you 。 / No, you 。5. David has to stop practising because ofhis illness. (改为一般疑问句,并作肯定回答) — David stop practisingbecause of his illness? — Yes, 。 Key:1. had to 2. mustn’t 3. will have to 4. needn’t; don’t have to 5. Does; have to; he does

must用法详解 篇三

1、表示“必须”、“一定要”

(1) 可用于肯定句、否定句或疑问句;用于否定句时,mustn’t 的意思是“一定不要”、“不能”,而不是“不必”。如:

You must finish it today. 你一定要在今天完成它。

You must see the doctor. 你一定要看医生。

Must you go so soon? 你一定得这么早就走吗?

We mustn’t think only of ourselves. 我们可不能只考虑自己。

(2) 主要表示现在或将来,但有时(如在间接引语中)也可表过去(=had to)。如:

She asked if she must (had to) leave. 她问她是否一定要离开。

(3) 对于must 开头一般疑问句,若要作否定回答,可用needn’t、don't have to,不用mustn’t。如:

“Must I come over tonight?” “No, you needn’t.” “我今晚必须过来吗?”“不必。”

(4) 其后可接被动结构或进行形式。如:

Something must be done to stop it. 必须采取措施来阻止它。

I think I must be going. 我想我得走了。

2、表示推测

意为“准是”、“一定是”,注意以下几点。如:

(1) 通常只用于肯定句,在否定句或疑问句用 can 代之。如:

It must be true. 那一定是真的。

比较。如:Can it be true? 那可能是真的吗? / It can’t be true. 那不可能是真的。

(2) 后接动词原形,表示对现在情况的推测。如:

He must be wrong. 他一定错了。

The man must have a lot of money. 这个人一定有不少钱。

【注】must 表示对现在情况的推测后接动词原形时,该动词通常为状态动词(如 be, have, know 等),若为动作动词,通常要转换其他说法。如要表示“他一定会赢”,通常不说He must win,可说He is sure to win。(He must win的意思是“他必须要赢”)

(3) 其后可接进行式或完成进行式,用以谈论一个正在进行的动作。如:

He must be writing a letter to his girl friend. 他一定在给他女朋友写信。

Someone must have been smoking here.一定有人一直在这里抽烟。

(4) 后接完成式,用来谈论已发生的情况。如:

He must have arrived already.他一定已经到了。

I didn’t hear the phone. I must have been asleep. 我没有听到电话铃,我一定是睡着了。

3、表示“应当”

相当于should, ought to的意思。如:

You must say hello to her.你应当跟她打个招呼。

We must go and have a weekend there.我们应当到那里度周末。

4、表示“偏偏”

有时表示不巧,有时表示固执,通常都是指令人不快的事。如:

Must you make so much noise? 你就非得弄出这么大的声音吗?

Why must you always interrupt me? 你为什么硬是老要打断我?

We were ready to leave, but the baby must catch cold. 我们刚准备好要走, 可孩子偏偏得了感冒。

Just when I was busy, the neighbor must come and chatter. 正当我忙碌的时候,邻居偏偏过来聊天。

关于“must”的这些用法,你“必须”知道! 篇四

must be\ must do 用于现在时

He keeps looking at you, he must like you.

他一直在看你,他一定是喜欢你吧

She looks so beautiful, she must be a model.

她好漂亮,她一定是模特吧

He has been working out for 5 years, he must be very strong.

他已经健身5年了,他一定特别强壮吧

2 must have been\ must have done用于过去时

He didn't show up last week, he must have been on vacation.

他上周一直没出现,他一定是去度假了

She must have been very excited, when her boyfriend proposed to her last night.

昨天晚上她男朋友向她求婚,她一定十分兴奋。

You got a 20% pay rise, you must have done a great job.

你的薪水涨了20%,你一定做得特别好吧!

You must wear a suit when you have a interview.

你面试的时候一定要穿西装

He must finish all his work before the meeting.

他必须要在会议前完成所有的工作

We must double confirm it before release.

我们一定要在发表前再次确认

You must fasten your seatbelt when you're driving.

你开车的时候一定要系上安全带

You must show your passport to the immigration officer.

你必须要向移民官出示护照

You must follow the rules.

你必须要遵守这些规则

You must see a doctor, you've been sick for a week.

你务必要去看医生!你都已经病了一周了!

You must read that book! It's amazing!

你一定要去看那本书!真的是太棒了!

You must come to our party tonight! It'll be so much fun!

你一定要来参加我们今晚的派对!一定会非常有意思的!

Why must she always interrupt me?

她为什么总是要打断我?

Why must you argue with each other everyday?

你们非要每天都争吵吗?

Why must you make so much noise?

你什么偏要制造那么多噪音?

You may think the insurance is unnecessary, but it's a must.

你可能认为保险没有必要,但却是必不可少的

Eating Roast duck is a must if you come to Beijing.

如果你来北京,一定要尝尝烤鸭

It's a must to try different kinds of beer in Germany.

在德国尝试不同种类的啤酒一定是必须要做的事

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