情态动词主要用法总结can / could1.表能力：例：Can you type?She could run and was a good player.2.表允许, “可以”。
例：Can I come in?He said we could go to the shop for sweets.could 比can语气更委婉。
也可以用“may”.3.表猜测，多用于疑问或否定句。
例：Can it be true?He can’t be more than thirty.Where could he have gone?4.虚拟语气中用could.例：If you tried, you could do that work.5.表一时的情况, “有时候会…..”例：Children can be very annoying.Our house is on the top of the hill, and in winter the winds can be very cold.may / might1.表许可或征求同意, “可以”。
例：May / Might I leave?You may bring them back tomorrow.2.表可能性, “可能，或许”。
例：He may not be there.He thought it might be wise to try his luck there.You may/might have read some account of the matter.3.虚拟语气中用might.例：If you did n’t mind, we might go there.If it had not been for you, I might not have understood.4.may 表祝愿。
例：May you be happy!May God bless you!must1.“必须，一定要”。
例：You must see the doctor.2. 表猜测，“一定…..”。
例：Judging by the smell, the food must be good.He must have arrived by air.He must be working hard.3.表客观必然、不可避免, “必然会，肯定会”.例：All men must die.4.表说话人的不耐烦或令人不快的事，“偏要，偏偏”。
例：Just when we were ready to go away for the holidays, the baby must catch a cold. shall助动词用法：构成将来时，用于第一人称。
例：We shall read about this tomorrow. （也可以用will表示）情态动词用法：1．征求对方意见，用于一、三人称的疑问句。
例：Shall I turn on the light?Shall the boy wait?2.表示说话人的许诺、威胁、决心、规定、命令等，“一定要….”.例：I shall be there.I promise you shall see her again.Each competitor shall wear a number.should助动词用法：构成过去将来时，用于第一人称。
例：I told him that I should see him the next day.情态动词用法：1．表责任、义务，“应该”,相当于“ought to”。
例：Children should obey their parents.2．should have done的用法.3. 在其他特殊句型中的用法。
will助动词用法：构成一般将来时，多用于第二、三人称。
例：I must go ; the students will be waiting for me.情态动词用法：1.表请求，多用于第二人称，“…..好吗？”。
例：Will you type this letter, please?2.表意愿，“愿意”。
例：Go where you will.I will pay you at the rate you ask.3. 表习惯、经常性、倾向性，“总是会…,老是会….”.例：He will ask silly questions.Sometimes the cat will lie there all afternoon.Oil and water will not mix.This machine will not work.would1.构成过去将来时；2.will的第２、３用法的过去形式；3.表虚拟语气。
need情态动词用法：1.用于否定和疑问句。
例：Need I tell her?You needn’t do it.2.用于I don’t think这类的否定结构后面。
例：I don’t suppose I need wear a coat.I asked him whether he need go.行为动词用法:1.need ＋名词／代词；2.need to do sth.3.need sb. to do sth.4.sth. need doing = sth. need to be done;dare情态动词用法：用于否定句、疑问句或条件句：例：No one dared speak of it.How dare you ask me such a question?I wonder if she dared come home.行为动词用法:1.dare (to) do sth. (否定和疑问句可省略to)例：He dares to accuse me of dishonesty.He does not dare (to) answer.2.dare sth.敢于面对….，敢于尝试….例：He will dare any danger.3.dare sb. to do sth. 激某人做某事例：He dared me to jump over the stream.Exercise1.The plant is dead. I _____ it more water.A. will giveB. would have givenC. must giveD. should have given2.– How did you go to the concert yesterday evening?-- I went on foot, but I ____ by bus.A. might goB. should be goneC. could have goneD. ought have gone3.Very loud noises ____ make people ill, hurt their ears, or even drive them mad.A. mustB. needC. canD. should4.-- ____ I get you some food?-- No, thanks.A. MightB. ShallC. WillD. Ought5.He had sent me the money he owed me, so I ____ to him for it.A. needn’t have writtenB. didn’t need to writeC. needn’t to writeD. needn’t wrote6.Teachers and pupils ___ look coldly at you for a day or two, but there are friendly feelings intheir hearts.A. mustB. canC. mayD. should7.He has promised his daughter that she ___ have a new bike.A. shallB. wouldC. mightD. need8.You must have seen him yesterday, ____?A. don’t youB. didn’t youC. mustn’t youD. haven’t you9.You must have seen a lot of films, ____?A. don’t youB. did youC. mustn’t youD. haven’t you10.Why ____ you always interrupt me?A. canB. have toC. mustD. will11.He ___ get up early when he lived in the country.A. wouldB. couldC. shouldD. might12.I have told him many times but he ___ listen to my advice.A. shall notB. won’tC. couldD. was able to。