高二英语it的用法-旧人教版

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人教版英语选修六高二 unit3 语法 Grammar— it的用法(1)

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高中情态动词用法总结

情态动词的用法 A. can; could; be able to Can 1. 表示“能力”(此时过去时是could) 2.表示许可、请求,“可以”。--Can/Could I go now? 3 表示推测, 把握很大,could也可表推测,把握比can小。 --Look! Someone is coming! Who can it be? --It can?t be him. He has gone to Paris.(不可能)/ He could be here soon. 他很快就来。 4 表示感情(惊异/不耐烦)“究竟,到底”(主要用于否定句,疑问句和感叹句中。) How can you be so foolish? What can it possibly be? 到底那是怎么一回事? They can?t be working at this time of day. 5 肯定句中客观存在的可能性。“有时会,偶尔” It can be quite windy there, especially in spring. Could 1.表示能力,can 的过去式,过去能够 Could you speak English then? 那时候你会说英语吗? 2. 请求允许(委婉语气)(问句的答语不用could,而用can,) Could [Can] I use your pen? ” “Yes, of course you can.”/ No, I?m afraid not. 3. 表示推测可能性(肯,否,疑) We could go there this summer. 今年夏天我们可能要去那儿。(将来可能性) You could be right, but I don?t think you are. 你可能是对的,但我并不认为你是对的。 4. could have done ①对过去推测,可能已经。。。②本来能够却没做,差点就 He can?t [couldn?t] have seen her there. 他不可能在那儿见到她。 He could have gone home. 他可能已回家了 He could have told her, but he didn?t choose to. 他本来可以告诉她的,但他却没有。 B. may 和might 1.表示允许﹑许可,might提问更委婉。 ---May/Might I watch TV after supper? ---Yes, you may./ Yes, please./ Certainly. ---No, you mustn't. / No, you may not. / No, you can?t./No, you?d better not. 2. 表示推测,有“或许”、“可能”的意思。might把握更小。疑问句用can/ could. ?He may/might be right./ I hear there may be a few copies left. ?He may/might come today (tomorrow). 3. may表示祝愿,倒装。May +主语+动词原形。May you succeed!/May you all be happy. ☆may [might] as well…意为“不妨”、“还是…为好”等,用might 比用may 语气更委婉。如:I?m ready,so I might as well go now.我已准备好,因此不妨现在就走。 There?s nothi ng to do, so I may [might] as well go to bed. ☆may well... 完全可能 C. must, have to Must 1. 表示“必须”。否定式mustn?t表示“不可以”、“不准”、“禁止”等。 Everybody must obey the rules../You mustn?t lend it to others./You mustn?t speak like that to your mother. ☆在回答有“must” 的询问时,--- Must I go now? --- Yes, you must. ---No, you needn?t. / No, you don?t have to.

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