D. should have someone to wake her up
3.---Did you go to the movie the day before yesterday?
----No. We _A__, but we decided not to.
A.should have gone B. could go
You had better not go home, had you?
例2： 你应该认真学习，是吗？
You should study hard, shouldn't you?
例3： 你上课不应该讲话，是吗？
He oughtn't to speak in class, ought he?
❖ 1．The flower is dead. I ___C____ it yesterday.
had better(最好), should(应该)与ought to （应该）均为提建议、阐述观点的情态动词， 其后接动词原形。should 比had better语气强， ought to语气最强。一般情况下should与 ought to可通用。
例1：你最好立即去那里。 You had better go there at once. 例2：你应该努力工作。 You ought to / should work hard.
➢巩 固 练 习
1.Oh, I’m not feeling well in the stomach. I _B___ so much fried chicken just now.
A. shouldn’t eat B. shouldn’t have eaten
C. mustn’t eat D. mustn’t have eaten
Grammar
情态动词
❖非推测性情态动词shall, will, must, mustn’t, should, would的用法
❖情态动词must, can/could, may/might, should/ought to表猜测的用法
❖情态动词could, should/ought to, may/might , needn’t+ have done 表示 假设的用法
2.作实义动词用，常ຫໍສະໝຸດ 在肯定句中, 有人称、 时态、和数的变化 He needs to go there himself. He has grown up,we don’t need to worry about him.
3.Sth (sb) need( want, request)+ doing/ to be done The house needs cleaning/ to be cleaned The boy needs sending to the hospital at once.
❖ A．discuss B．discussing C．to discuss D．discussed
❖ 5．You ought to ___D____ him, but you didn’t.
❖ A．help B．helped C．helping D．have helped
❖情态动词的一些惯用法
表示推测——情态动词的重要用法.
情态动词
对将来
肯定的推测
+ V.
must 常见must be
对现在
对过去
+ V.
+ have done
+ be doing
可能的推测
may, might
否定的推测
can’t, couldn’t
疑问的推测
can, could
+ V.
+ V.
+ have done
例2： 她不应该浪费时间。 She oughtn't to waste time.
（二）一般疑问句 had better, should, ought to用于一般疑 问句时，分别将had, should, ought提至 句首。 例1： 他最好立即出发吗？
Had he better start early at once? 例2：你应该这么做吗？
C. should go
D. could have gone
4.As it turned out to be a small house party, we __D__ so formally.
A.needn’t dress B.B. didn’t have to dress up C. Might not have dressed up D. needn’t have dressed up 5.I’m rather surprised you haven’t reported him
（一）否定句 had better, should, ought to用于否定句时， 否定词均位于其后，具体形式为： had better not do, shouldn't / should not do, oughtn‘t to do。 例1此时你最好别出发。： You had better not start at this time.
Should you do like this? 例3： 他应该去那里吗？
Ought he to go there?
（三）反意疑问句
陈述句谓语动词含 had better, should, ought to时，反意疑问句 为：had, should与ought+主格人称代词或 hadn‘t, shouldn’t, oughtn‘t+主格人称代词。 例1：你最好别回家，是吗？
句型 时态
动词
情态动词dare
实义动词 dare
肯定句
现在时 dare do
dare/dares to do
过去时 dare do
dared to do
否定句
现在时 daren’t/dare not do do/does not dare (to) do
过去时 dared not do
did not dare (to) do
4.As it turned out to be a small house party, we __D__ so formally.
A needn’t dress B. didn’t have to dress up C. Might not have dressed up D. needn’t
have dressed up
Nobody need to be afraid of catching the disease. Nobody need be afraid of catching the disease.
These dishes need be cleaned carefully. These dishes need to be cleaned carefully. These dishes need cleaning carefully.
to your teacher. In my opinion, you _C__ this as soon as you found out he was cheating. A. must have done B. might have done B.C. should have done D. could have done
疑问句
现在时Dare he do?
Do you/Does he dare (to) do?
过去时 Dared he do? Did he dare (to) do ?
2.I wonder how he_D___that to the teacher.
A. dare to say B. dare saying C.not dare say D.dared say
1.判断正误: How dare you say such a thing?
How dare you to say such a thing?
He daren’t to speak English before such a crowd, did he?
He daren’t speak English before such a crowd, dare he?
2.He must have gone to Beijing. 他一定已经去北京了。
•can/could+have done表示对过去
的行为的怀疑和不肯定，通常用在否 定句和疑问句中。
1. Can they have won the basketball match? 他们可能赢了篮球赛吗？
2. It couldn’t have been Mr. Green. He has gone to New York.
那不可能是格林先生的，他已经去北京了。
could(不用can)+have done,在肯定 句中表示“本来能够…而没能…”，具 有婉转的批评和责备之意。
You could have told me earlier. 你本该早点告诉我的。
should/ought to+have done用于肯定 句时，表示“本该做某事而实际上没 做”，用于否定句时，则表示“不该 做的事反而做了”。
可兼做行为动词的情态动词：need 、 dare
1.作为情态动词用，常用在否定句和疑问句中。 Dare (need) +S +V S + daren’t (needn’t) +V
I daren’t walk through the forest at night. Dare you walk through the forest at night? You needn’t return the book now. Need he go yesterday?