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) |