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can/could 1) 表能力=be able to Can you dance? Yes, I can. / No, I can't. 2) 表请求，允许 (could语气较委婉） Can I use your pen? Yes, please./No, I'm afraid not. 3）表猜测，可能，多用于否定句及疑问句，并表不太可能。（could可表虚拟） He can't be at home now. What can he be doing? 4）其它常用语 I can't help laughing. (禁不住） I can't but ask him about it.（只得） may/might 1) 表猜测 He may not know it. She may be ill. 2) 表请求，许可 May I use your pen? May I smoke here? Yes, you may. / No, you mustn't (can't) *3) 表责备，只用might，且用于肯定句。 You might ask before you borrow my car. You might have helped me. *4) 其它用法 You may as well give him the letter. (还是） His appearance has changed so much that you may well not recognize him.(很可能） must 1）表命令，许可 = have to Must I go now? Yes, you must. / No, you needn't. mustn't意为“不许” You mustn't smoke here. 2) 表猜测，可能性较大 He must be an actor. need 表必须，仅用于否定句或疑问句中，在肯定句中一般用must, have to, ought to,或should代替。 You needn't come so early. Need I finish homework today? Yes, you must. shall/should 1）表命令，在某种程度上相当于must，ought to You should do as I told you. 2) 表建议，要求 You should tell the the police. 3) 询问意见 Shall I get you some fresh coffee? will/would 1）表意愿 I won't argue with you. 2) 表请求，邀请 Will you go with me? Would you please close the door? 今天做得头发大了，其余的以后再慢慢加上吧！ (责任编辑：admin) |