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B．情态动词除ought to, used to等外，后面只接不带to的不定式。
1．情态动词+do
You shouldn't be so careless.你不该这样粗心大意。
Jessica told him yesterday she might not go on the trip.
杰西卡昨天告诉他，她可能不去旅行了。
Difficulties can and must be overcome.
困难能够而且必须克服。
2．情态动词+be doing
She must be listening to pop music.
她肯定在听流行音乐。
You should be reviewing your lessons.
你应该在复习功课。
My mother maymight be cooking now.
我妈妈可能正在做饭。
3．情态动词+have done
They might have visited the Great Wall.
他们可能参观过长城了。
He must have got up very early to catch the train.
他一定起得很早去赶火车了。
You ought to have come earlier.
你本该早一点儿来。
4．情态动词+be done
This word can also be used as a verb.
这个词也可以用作动词。
Something must be done to stop pollution.
必须采取措施来制止污染。
The work ought to have been finished long ago.
这工作早就该完成了。
C.情态动词第三人称单数一般现在时没有词形变化。
You ought to wear a raincoat.
你应该穿件雨衣。
She ought to wear a raincoat.
她应该穿件雨衣。
Plants must have oxygen in order to live.
为了存活植物必须有氧气。
A plant must have oxygen in order to live.
为了存活植物必须有氧气。
D.情态动词的时态并不是区分时间的主要标志。在一些场合中，情态动词的现在式和过去式都可以表示现在时间、过去时间或将来时间。
I'm afraid it might rain tonight.
我看今晚可能要下雨。
Could I borrow your thermos
我可以借用你的暖水瓶吗？
It's a nice day today. We could go for a walk.
今天天气不错，我们可以出去散散步。
E.情态动词是互相排斥的，一般不允许两个意义相近的情态动词连用。
【误】Soldiers must have to
obey orders.
【正】Soldiers have to obey orders.
军人必须服从命令。
【正】Soldiers must obey
orders.
军人必须服从命令。
【误】Can I be able to borrow
two books at a time
【正】Can I borrow two books at a time
我能一次借两本书吗？
【正】Will I be able to borrow
two books at a time
我能一次借两本书吗？
一、 情态动词的意义和用法
A. may和might
1．表示请求、许可，常译为“可以”。
在口语中可用can,
could代替may，但在正式场合用may。表示允许时，也可用might代替，might不表示过去时，而是表示口气比较婉转。
You may
take this seat if you like.
如果你喜欢可以坐这个位置。
MayCan
Could Might I have a talk with you
我可以和你谈谈吗？
---
MayMight I come into the room to see my mother
我可以进房间看我母亲吗？
--- No,
you mustn't. She needs to have a good rest.
不，你不能进。她需要好好休息。
提示：
May I ...问句常见的肯定回答和否定回答。
肯定回答
Yes, please.
Certainly.
Yes, of course.
Sure.
Go ahead, please.
否定回答
No, you can't.（最常见）
No, you mustn't.（具有强烈禁止的意思）
Please don't. You'd better not.
I don't think you can.
I'm sorry it's not allowed.
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