We can be there on time tomorrow.
May I have your name?
Shall we begin now?
You must obey the school rules.
情态动词数量不多,但用途广泛,主要有下列:有can (could), may (might), must, need, dare (dared), shall, will (would), should, ought to, have to, used to, had better, would rather 等 情 态 动 词 的 种 类 情 态 动 词 的 位 置
情态动词在句中放在谓语动词之前,疑问句中, 情态动词放在主语之前。
I can see you. Come here.
He must have been away.
What can I do for you?
How dare you treat us like that!
情 态 动 词 的 用 法 要 点 1.表示能力的can/could和be able to
1) can表示具有某种能力或技能,意为“能,会”。 Who can answer this question? 2)can 的过去式为could,但它通常只表示过去一般性能力,不表示过去特定场合下的能力,遇此情况要用 was/were able to。如: I could run faster then. 我那时能跑得更快一些。 They were able to jump into the sea before the boat was blown up.他们在船爆之前跳入海里。 3) be able to 有时态,人称,数的变化,amisarewill be waswere able to 。 2.表示许可 1)Shallmaymightcancould Iwe…? Shall he shethey…? Wouldwill you …? — Could (Can, May, Might) I use it? — Yes, you can (may).可以。(不用 could/might) -- no, I’m afraid not. 在答语中表示允许别人做某事要用can/may,不能用 could/might。
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