must用法详解.doc

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1、must用法详解 今天给大家带来must用法详解，我们一起来学习吧，下面就和大家分享，来欣赏一下吧。must用法详解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，mustnt 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 mustnt 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

2、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neednt、dont have to，不用mustnt。如：Must I come over tonight? No, you neednt. “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

3、”、“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 cant 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

4、“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 didnt hear the phone. I must

5、 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 leav

6、e, 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!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 worki

7、ng 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 didnt 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 m

8、ust 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 youre driving.你开车的时候一定要系上安全带You must show yo

9、ur 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, youve 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! Its amazing!你一定要去看那本书!真的是太棒了!You must come to our party tonight! Itll 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

10、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 its 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Its a must to try dif

11、ferent 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must和have to的用法区别到底在哪里?你“必须”知道! 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。Alices 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

12、。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，mustnt表示“不许，禁止”;dont/doesnt/didnthave to表示“不必，无须”，相当于neednt。如：Look at the sign. You mustnt park here.看那个标志，这里禁止停车。We dont have

13、to/neednt 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neednt或donthave 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 oclock?我必须在九点以前回来吗? Yes, you must. / No, you dont have to/neednt.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. /

14、No, she doesnt.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 sto

15、p 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. mustnt 3. will have to 4. neednt; dont have to 5. Does; have to; he does不能用被动语态的情况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”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（文库搜索）