2020年高考英语语法必考知识点：情态动词专项练习1、—How come everything tastes bitter?—Well,things________taste different to you when you are suffering a cold.A.mayB.shouldC.mustD.would2、—Who______it be that is knocking at the door?—It______be Father,but I’m not sure.A.can;mustB.can;mayC.must;canD. may;must3、English is a language that many people around the world__________ not speak perfectly but_________at least understand.A.may;canB.would;mightC.will;mustD.could;might4、—Why didn’t Mary come to John’s birthday party last night?—She wanted to,but her dad simply______not let her out so late at night.A.shouldB.mightC.wouldD.could5、—Listen!There is a knock on the door．Who_____it be?—It must be Jack．Just now I sent for him．A．shall B．can C．must D．might 6、─What do you think I can do about it?─Don’t worry.The information______be true.A.mustn’tB.can’tC.wouldn’tD.might7、—I’m sorry.I_______at you the other day.—Forget it.I was a bit out of control myself.A.shouldn’t shoutB.mustn’t shoutC.shouldn’t have shoutedD.mustn’t have shouted8、Samuel,the tallest boy in our class,______easily reach the books on the top shelf.A.mustB.shouldC.canD.need9、—What does the sign over there say?—No person______enter the area without the official permission. A.Shall B.may C. must D.will10、—Mum,I am sorry,but I failed in the English exam.—So you__________get the MP4you want.I am sorry,too.A.shall notB.might notC.needn’tD.shouldn’t11、The Chinese government advocates that countries along the modern silk road work together and share future success.A.mustB.mightC.shouldD.could12、—Did you lock the door？—No,I____,but I forgot.A.shouldB.must haveC.mustD.should have13、It is usually warm in my hometown in March,but it_____be rather cold sometimes.A.mustB.canC.shouldD.would14、The best and most beautiful things in the world_____be seen or even touched.They must be felt with the heart.A.can’tB.mustn’tC.needn’tD. shouldn’t15、Part of the highway would still be temporarily closed________the heavy fog continue.A.mightB.couldC.wouldD.shouldKeys1、A2、B3、A4、C5、B6、B7、C8、C9、A10、A 11、C12、D13、B14、A15、D情态动词(Modal verbs)本身有一定的词义，表示语气的单词。
但是不能独立作谓语，只能和动词原形一起构成谓语。
情态动词用在行为动词前，表示说话人对这一动作或状态的看法或主观设想。
情态动词虽然数量不多，但用途广泛，主要有下列:can(could),may(might),must,need,ought to,dare(dared), shall(should),will(would)等。
下面根据高考的考点，对重点用法进行总结。
1、can和could(could为can的过去式)的基本用法(1)表示能力He can speak English better than you.(2)在疑问句和否定句中表示“怀疑”、“猜测”或“可能性”Can this green bike be Liu Dong's?(3)表示“许可”时can可以和may换用You can(may)go home now.(4)如果要表示语气婉转，可用could代替can，这时could不再是can的过去式Could you come again tomorrow?(5)can和be able to都可表示能力，两者在意思上没有什么区别。
但是can只能有现在式和过去式，而be able to则有更多的形式，He will be able to do the work better.2、may和might(might为may的过去式)的基本用法(1)表示允许或征询对方许可，有“可以”之意You may use my dictionary.在回答对方说“可以做某事”或“不可以做某事”时，一般多不用may或may not，以避免语气生硬或不容气。
而用比较婉转的说法进行回答。
----May I use this dictionary?----Yes,please./Certainly.在请求对方许可时，如果Might I…?就比用May I…?语气更婉转些May I have a look at your new computer?表示“阻止”或“禁止”对方做某事时，要用must not代替may not----May we swim in this lake?----No,you mustn’t.It’s too dangerous.(2)may或might都可以表示可能性，表示“或许”、“可能”之意，如果用might 表示可能性，则语气更加不肯定They may(might)be in the library now.3、must的基本用法(1)must表示“必须”、“应该”之意，其否定式must not，缩写形式为mustn't，表示“不应该”，“不准”、“不许可”或“禁止”之意We must study hard and make progress every day.You mustn't touch the fire.(2)对以must提出的疑问句，如作否定回答时，要用needn't或用don't(doesn't) have to(不必)来回答，而不用mustn't，因为mustn't表示的是“禁止”或“不许可”之意----Must we finish the work tomorrow?----No,you needn't(don't have to),but you must finish it in three days.(3)在肯定句中must可以表示推测，表示“一定”或“必定”之意----Whose new bike can it be?----It must be Liu Dong's.I know his father has just bought him a new one.4、can,could,may,must后接完成式的用法(1)can,could后接完成式的用法：①在否定句或疑问句中表示对过去发生过的事情的“怀疑”或“不肯定”的态度Could he have said so?②在肯定句中，可以表示过去可能做到而实际并没做到的事情，有“劝告”或“责备”的语气。
如：----When did you answer her letter?----Only yesterday.----It's too late.You could have answered it earlier,I am sure.(2)may,might后接完成式的用法①表示对过去某事的推测，认为某一件事情在过去可能发生了。
如果使用might，语气就比较婉转或更加不肯定Mary might have learned some Chinese before.②可以表示过去本来可以做到而实际没有做到的事情，有“劝告”或“责备”的语气You didn't do the work well that day.You might have done it better.(3)must后接完成式的用法：表示对过去某事的推测，认为某事在过去一定做到了Liu Dong isn’t in the classroom.He must have gone to the library.5、have to的基本用法及与must的区别：have to和must的意义相近，只是must侧重表示说话人的主观看法，而have to则表示客观需要I must study hard.I had to give it up because of illness.6、ought to的基本用法(l)表示根据某种义务或必要“应当”做某事，语气比should强Everyone ought to obey the traffic regulations.(2)表示推测，注意与must表示推测时的区别：He must be home by now.(断定他已到家)He ought to be home by now.(不十分肯定)This is where the oil must be.(比较直率)This is where the oil ought to be.(比较含蓄)(3)“ought+have+过去分词”表示过去应做某事而实际未做。