(2)need和dare用于实义动词时,有词形变化。变成否定句、疑问句时，需要加助动词。
You don't need to do it yourself.你不必亲自做这件事。
We should dare to give our own opinion,我们要敢于提出自己的观点。 2.几个可以表示某一特定的语气或态度的情态动词
(1)can可以用来表示惊异、怀疑、不相信的态度，主要用于否定句、疑问句或感叹句中。
How can you be so careless? 你怎么这么粗心?
(2)must用于条件句或疑向句中,可以用来表示责备、抱怨的感情色彩，意为“偏要，硬要”。
Why must you be so late?你为何非要这么晚来呢? (3)may表示愿望、祝福时,有“但愿.....之意。 May you succeed!祝你成功!
(4)should表示惊讶、不以为然等情绪,用于某些句型中，多意为“竟然”。 It seems unfair that this should happen to me. 这种事情竟然发生在我的身上，好像不公平。 (5)will的用法
will表示“意愿，意志”，would表示过去时间的“意愿，意志”。will还可以表示某种倾向或习惯性动作,意为“总会，老是”，其否定结构意为“不肯,不能\ I will do anything for you.我愿意为你做任何事。 The door won't open.这门打不开。
Every time she was in trouble,she would turn to him for help.每次遇到麻烦她都会向
他求助。
3.情态动词的一些习惯用法
(1)cannot/can never. .. too或cannot... enough表示“无论怎\也不过分;越....越好”。 You cannot be too careful.你越细心越好。
(2)cannot help doing.../cannot. hep but do. .. /cannot but do.... 表示”禁不住;不得不”。 1 couldn't help jumping up when I saw him. -看到他我就情不自禁地跳了起来。 1 cannot but admire his bravery.我不得不佩服他的勇敢。
(3)“may/ might as well+ 动词原形”表示“还不如,不妨”，相当于had better。 It is very late,so you may/might as well go to bed.夜深了,你不妨去睡吧。 [练全题点] 单句语法填空
1. George________(go) too far. His coffee is still warm.
2. It was really annoying; I ________ get access to the data bank you had recommended.
3.一Can't you stay a little longer?
- It's getting late. I really ________go now. My daughter is home alone. 4.It was so noisy that we________ not hear ourselves speak.
5. You________be Carol. You haven't changed a bit after all these years.
-6. You_______feel all the training a waste of time,but I'm a hundred percent sure later you'll be grateful that you did it.
7. You________be careful with the camera. It costs! 8.---Sorry, Mum! I failed the job interview again.
---Oh,it's too bad. You________have made full preparations.
9. I_______have worried before I came to the new school,for my classmates here are very friendly to me.
10. It was sad to me that they, so poor themselves，_________bring me food.
考点清单二 非真实条件状语从句中的虚拟语气
1.表示与现在事实相反的假设
条件状语从句中的谓语动词用般过去时(be动词用were).面主句中的谓语动词用would/should/ could/might +动词原形”。
If I were you,1 would buy that house.如果我是你,我会买那所房子。 If he had time.he should go wit you.如果他有时间，他会跟你一一起去。 2.表示与过去事实相反
条件状语从句中的谓语动词用过去完成时，主句中的谓语动词则用“would/should/might/could+have+过去分词”。
If he had taken my advice ,he would have succeeded in passing the examination.如果他听取我的建议，他会成功通过考试的。 3.表示与将来事实相反
条件状语从句中的谓语动词用一般过 去时或“should/ were to+动词原形”，而主句中的谓语动词则用“would/ should/ could/ might +动词原形”。
.If it were to rain tomorrow, the football match would be put off.如果明天下雨，足球比赛就会推迟。 4.省略if的虚拟条件句
当虚拟条件句中有should,had或were时,可以省略if,且把should,had或were提至主语前，变为倒装句式。
Had he seen you yesterday,he would have returned your book. 假如他昨天看见你的话，就会把书还合你了。
Should it rain tomorrow，the sports meeting would be put off. 如果明天下雨,运动会就延期。 5.混合虚拟语气
当条件从句和主句所表示的动作发生的时间不一致时，就形成了混合虚拟语气。此时，从句和主句根据各自谓语动作发生的时间不同，采用相应的谓语动词形式。 If I shouldn't have an exam this afternoon,I would go shopping now.
如果不是今天下午要考试，我现在就去购物了。(从句指将来,主句指现在) If you had taken my advice then,you wouldn't be in trouble now.
如果当时听我的劝告，你现在就不会有麻烦了。(从句指过去，主句指现在) 6.含蓄虚拟条件句
有时假设的情况不通过if条件从句表达出来，而是通过一些词或短语表达出来。如with,without,but for等表示或隐含在上下文中。 I'm really busy; otherwise,I would certainly go with you. 我确实太忙了，不然的话，我一定和你起去。 But for the rain we should have had a pleasant journey. 要不是下雨，我们会有一次愉快的旅行。 [练全题点]单句语法填空
1.1 was wearing a seat belt. If I hadn't been wearing one,I_______(injure).
2. Had the governments and scientists not worked together, AIDS related deaths_________(fall) since their highest in 2005.
3.1________(be) a different person if my mom hadn't turned a silly bicycle accessory into a life lesson I carry with me today.
4.If I_______(see) it with my own eyes,I wouldn't have believed it.
5. Without his wartime experiences, Hemingway__________( write) his famous novel A Farewell to Arms.
6.It is lucky we booked a room,or we_______(have) nowhere to stay now.
7.If Mr. Dewey_______(be) present, he would have offered any possible assistance to the people there.
8. They were abroad during the months when we were carrying out the investigation,or they ________(come) to our help.
9. We________(be) back in the hotel now if you didn't lose the map.
10. Had he_________(catch) the morning train, he would not have been late for the meeting.
考点清单三 名词性从句中的虚拟语气
1.虚拟语气在宾语从句中的用法
(1)表示“命令、建议、要求”等的动词，如suggest, order, insist等后的宾语从句中，谓语动词用“(should+ )动词原形”。
1 suggest that we (should) set off at once. 我建议我们立刻出发。
I recommend that everyone (should) attend the party. 我提议大家都参加这次聚会。
特别点击
suggest表示“暗示，表明”,insist表示“坚持认为”时，其后的从句不用虚拟语气。 The smile on his face suggested that he agreed to this plan.
2020年高三英语一轮复习语法专项---情态动词和虚拟语气(无答案)
