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1、情态动词造句情态动词造句 情态动词不能表示正在发生或已经发生的事情，只表示期待或估 计某事的发生。大家不妨来看看小编推送的情态动词造句，希望给大 家带来帮助！态动1.You may come anytime you want.Student may not sleep in class2.I would go to Norway one day.I would not choose this color.3.You should respect your teacher.You should not make noise when the baby is sleeping.4.I can sp
2、eak 3 languages.I can not finish it in 1 hour.5.You must finish your homework before playing with the dog.You must not eat it up if you are full.情态动词及其用法1) 情态动词不能表示正在发生或已经发生的事情，只表示期待 或估计某事的发生。2 )情态动词除ought和have夕卜，后面只能接不带to的不定 式。3) 情态动词没有人称，数的变化，即情态动词第三人称单数不 加-s。4 )情态动词没有非谓语形式，即没有不定式，分词，等形式。 比较 can 和
3、 be able to1)can could表示能力；可能(过去时用could),只用于现在式和 过去式(could)。be able to可以用于各种时态。They will be able to tell you the news soon.他很快就能告诉你 消息了。2 ）只用 be able toa. 位于助动词后。b. 情态动词后。c. 表示过去某时刻动作时。d. 用于句首表示条件。e. 表示成功地做了某事时，只能用 was/were able to， 不能用 could。He was able to flee Europe before the war broke out. = He
4、 managed to flee Europe before the war broke out. 注意：could不表示时态1 ）提出委婉的请求，（注意在回答中不可用could ）。- Could I have the television on?- Yes, you can. / No, you cant.2）在否定，疑问句中表示推测或怀疑。He couldnt be a bad man.他不大可能是坏人。比较may和might1） 表示允许或请求；表示没有把握的推测；may放在句首，表 示祝愿。May God bless you!He might be at home.注意：might表
5、示推测时，不表示时态。只是可能性比may小。2）成语：may/might as well，后面接不带to的不定式，意为 不妨。If that is the case, we may as well try.典型例题Peter _come with us tonight, but he isnt very sure yet.A. must B. may C. can D. will答案B.表可能性只能用may.此句意可从后半句推出。比较 have to 和 must1）两词都是必须的意思，have to表示客观的需要，must表示 说话人主观上的看法，既主观上的必要。My brother was
6、 very ill, so I had to call the doctor in the middle of the night .我弟弟病得很厉害，我只得半夜里把医生请来。 （客观上需要做这件事）He said that they must work hard. 他说他们必须努力工作。 （主观上要做这件事）2）have to有人称、数、时态的变化，而must只有一种形式。但 must可用于间接引语中表示过去的必要或义务。He had to look after his sister yesterday.3）在否定结构中：do nt have to表示不必must nt表示禁止，You do
7、nt have to tell him about it.你不一定要把此事告诉他。You must nt tell him about it.你一定不要把这件事告诉他。 must表示推测1）must用在肯定句中表示较有把握的推测，意为一定。2）must表对现在的状态或现在正发生的事情的推测时，must后 面通常接系动词be的原形或行为动词的进行式。You have worked hard all day.You must be tired. 你辛苦干一 整天，一定累了。（对现在情况的推测判断）He must be worki ng in his office.他一定在办公室工作呢。 比较：He
8、 must be staying there.他现在肯定呆在那里。He must stay there.他必须呆在那。3）must表示对已发生的事情的推测时，must要接完成式。I did nt hear the phone. I must have been asleep.我刚才没有 听到电话，我想必是睡着了。4）must表示对过去某时正发生的事情的推测，must后面要接不 定式的完成进行式。-Why didnt you answer my phone call?-Well, I must have been sleeping, so I didnt hear it.5）否定推测用cant。
9、If Tom didnt leave here until five oclock, he cant be home yet.如果汤姆五点才离开这儿，他此时一定还未到家。表示推测的用法ca n, could, may, might, must皆可表示推测，其用法如下：1）情态动词+动词原形。表示对现在或将来的情况的推测，此时动词通常为系动词。I dont know where she is, she may be in Wuhan.2）情态动词+动词现在进行时。表示对现在或将来正在进行的情况进行推测。At this moment, our teacher must be correcting
10、our exam papers.这时，我们老师想必在批改试卷。3）情态动词+动词完成时。表示对过去情况的推测。We would have finished this work by the end of next December.明年十二月底前我们很可能已完成这项工作了。The road is wet. It must have rained last night. 地是湿的，昨天晚上一定下雨了。4）情态动词+动词的现在完成进行时。 表示对过去正在发生事情的推测。Your mother must have been looking for you. 你妈妈一定一直在找你。5 ）推测的否定形式
11、，疑问形式用ca nt, could nt表示。Mike cant have found his car, for he came to work by busthis morning.迈克一定还没有找回他的车，因为早上他是坐公共汽车来上班的。 注意：could, might表示推测时不表示时态，其推测的程度不如 can, may。情态动词+ have +过去分词1) may(might) have + done sth, can (could) have + done sth 表示过去，推测过去时间里可能发生的事情。Philip may (might) have been hurt seri
12、ously in the car accident.Philip can (could) have been hurt seriously in the car accident.2) must have +done sth ，对过去时间里可能发生的事情的推测， 语气较强，具有肯定，谅必的意思。-Linda has gone to work, but her bicycle is still here.-She must have gone by bus.3) ought to have done sth, should have done sth 本应该做某事，而事实上并没有做。否定句表示不
13、该做某事而做了。You ought to (should) have been more careful in this experiment.He ought not to have thrown the old clothes away. (事实上 已扔了。)ought to在语气上比should要强。4) need nt have done sth本没必要做某事I dressed very warmly for the trip, but I neednt have done so. The weather was hot.5) would like to have do ne sth
14、本打算做某事I would like to have read the article, but I was very busy then. 三十五个经典句型帮你过写作关(英语四级)一、 the + est + 名词 + (that) + 主词 + have ever + seen ( known/heard/had/read, etc) the most + 形容词 + 名词 + （that） + 主词 + have ever + seen （ known/heard/had/read, etc）例句：Helen is the most beautiful girl that I have
15、ever seen.海伦是我所看过最美丽的女孩。Mr. Chang is the kindest teacher that I have ever had.张老师是我曾经遇到最仁慈的教师。二、Nothing is +er than to + VNothing is + more +形容词 + than to + V例句：Nothing is more important than to receive education. 没有比接受教育更重要的事。三、 cannot emphasize the importance of too much.（再怎么强调.的重要性也不为过。）例句： We cannot emphasize the importanee of protecting our eyes too much.我们再怎么强调保护眼睛的重要性也不为过。四、There is no denying that + S + V .（不可否认的） 例句：There is no denying that the qualities of our li
