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1)情态动词can(能够)，must(必须)，may(可以)
结构：主语+can/must/may+动词原型
He can make the tea.
Sally can air the room.
We can speak English.
★变疑问句将情态动词移到句首
Can he make the tea?
Can Sally air the room?
Can we speak English?
★变否定句在情态动词后面加not
He cannot make the tea.
Sally cannot air the room.
We cannot speak English.
★肯定回答及否定回答
Yes, he can. / No, he cannot.
Yes, she can. /?No, she cannot.
Yes, we can. / No, we cannot.
★特殊疑问句：(必背)
What can you do?
注意：情态动词的句子没有第三人称单数的变化，不要在情态动词或动词后面加s。
2)must/have to的区别
must 表示必须，是主观上觉得应该做，have to是不得不，是由于客观条件逼迫的必要要做
must 只能用在表示现在和将来的句子里，而have to do可以用在任何时态
3)must, may, might表示猜测：
· must do 表示对现在事实的猜测
· must have done表示对过去事实的猜测
· must have been doing 表示对过去正在进行的事实的猜测
· may/might do, may/might have done表示没有任何事实依据的猜测，might的可能性更小。
4)can't/couldn't 表示不可能
情态动词
~~~【每日一练】~~~
1. _____ you ready? (A) Are (B) Have (C) Will (D) Can
2. ____ here early? (A) Will he (B) Was he (C) Did he be (D) Were he
3. I ___ happy about the price of eggs. (A) am't (B) am not (C) do not (D) won’t
4. Since last year I____ him only once.
(A) have seen (B) have been seeing (C) see (D) was seeing
5. Donald ___ sixteen tomorrow. (A) is being (B) going to be (C) shall be (D) will be
6.I ___ the story at all. (A) don't like (B) like(C)am fond of(D) would like
7.I would rather ___ than play now. (A) to study (B)am studying(C) study(D) studied
8.I'd rather you ___ anything about it for the time being.
(A) do (B) didn't do(C)don't (D) didn't
9.The car___much money.
(A) not cost (B) not have cost (C) isn't cost (D) didn't cost
10. I ___ like to eat fish. (A) am (B) have (C) do (D) be
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发表于 2018-2-2 20:05:57