來源:中考網(wǎng) 作者:匿名 2009-11-05 14:39:24
情態(tài)動詞是中考最重要的考點之一,考試重點我們會分期講述。
情態(tài)動詞有四類:
①只做情態(tài)動詞:must,can(could),may(might),ought to
、诳勺銮閼B(tài)動詞又可做實義動詞:need,dare
③可做情態(tài)動詞又可做助動詞:shall(should),will(would)
、芫哂星閼B(tài)動詞特征:have(had) to,used to
情態(tài)動詞在句中放在謂語動詞之前, 謂語動詞前若有助動詞,則在助動詞之前,疑問句中, 情態(tài)動詞則在主語之前。
I can see you. Come here.
我能看見你,過來吧。
He must have been away.
他一定走了。
What can I do for you?
你要什么?
How dare you treat us like that!
你怎能那樣對待我們!
Can 和Could的用法
1. 表示能力或客觀可能性,還可以表示請求和允許。如:
Can you finish this work tonight?
Man cannot live without air.
— Can I go now? — Yes, you can.
注意:①could也可表示請求,語氣委婉,主要用于疑問句,不可用于肯定句,答語應(yīng)用can(即could不能用于現(xiàn)在時態(tài)的簡略答語中)。如:
Could I come to see you tomorrow?
Yes, you can. (否定答語可用No, I'm afraid not.)
、赾an表示能力時,還可用be able to代替。如:
I'll not be able to come this afternoon.
2. 表示驚異、懷疑、不相信的態(tài)度。(主要用在否定句、疑問句或驚嘆句中)
Can this be true?
How can you be so careless!
This cannot be done by him.
3. “can(could) + have + 過去分詞”的疑問或否定形式表示對過去發(fā)生的行為懷疑或不肯定。如:
He cannot have been to that town.
Can he have got the book?
4. 用在疑問句及否定句中,表示驚訝,不相信等.
5. cannot```too\enough表示"無論怎樣``````也不過分","越``````越好"
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