(
课件网) 情态动词和虚拟语气 情态动词的使用can/could could/may/might May sb. do sth. may/might as well must mustn't should will/would shall dare 表可能性或能力 表请求、允许时的委婉语气 表祝愿 不妨做...... “一定”；“必须”；”非要”（否定回答用needn't） “不可以”，表禁止 “竟然（表惊奇、失望、愤怒）”，“应当” 表意愿 （第一、三人称）表建议或征求意见； （第二、三人称）表命令、警告、允诺、威胁等 “敢” 1.You _____ be hungry already—you had lunch only two hours ago! 2.—Will you read me a story, Mummy —OK.You _____ have one if you go to bed as soon as possible. 3.Hurry up！He _____ be waiting for us anxiously right now can't shall must 9. It' s strange that he_____ speak in that way. should 情态动词 表推测 1.对现在和将来的推测 情态动词＋do 2.对过去的推测 情态动词+have done must will(很有可能） would（很有可能） ought to很有能 should can（可能） could （可能） may（可能） might（可能） 可能性由高到低 must have done can/can't have done could/couldn't have done may/might have done 一定做过某事（肯定的推测） 可能做过某事/不可能做过某事(可能推测) 可能做过某事/不可能做过某事(对过去的推测） 也许已经做了/也许已经做过某事（推测） 对过去的推测 情态动词 + have done(推测) 1.He is playing basketball now. I guess he_____(finish) homework. 2.He _____(know) the competition's results then, because he behaved patiently. must /can have finished might have known could/might have done should/ought to have done couldn't have done shouldn't have done needn't have done 本可以做某事（却没做） 本应该做某事（却没做） 不可能做了某事（却做了） 本不应该做某事（却做了） 没有必要做某事（却做了） 注意：情态动词+have done 也可表示虚拟 1.I _____(help)you, but I was too busy then. 2.The weather turned out to be fine yesterday, I _____ (take) the trouble to carry my umbrella with me. 3. I _____(do)my homework last night, but I went to the cinema. could have helped needn't have taken should have done 虚拟语气的使用 条件从句 从句谓语形式 主句谓语形式 与现在事实 相反 与过去事实 相反 与将来事实 相反 动词过去式 should/ would /could/ might+动词原形 had+过去分词 should/ would/could /might + have+过去分词 should/ would/ could/ might +动词原形 1.should+动词原形 2.动词过去式 3.were to+动词原形 虚拟语气 1. 虚拟条件句 1. If I were you, I_____(seize) the chance to go abroad. 2. If you had taken my advice, you_____ (pass) the driving test. 3. If he should not come tomorrow, we _____(put) off the meeting till next Monday. would seize would have passed would put 2.含蓄条件句出现without(没有), but for(要不是);but that(要不是)otherwise/or(否则）,主句谓语动词虚拟虚拟过去：would/should/could/mighthave done虚拟现在/将来：would/should/could/mightdoTangshan earthquake happened during the night, or/otherwisea lot of people_____(die).wouldn't have diedWithout buying, so many animals_____(kill).wouldn't have been killed当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，动词的形式要根据它所表示的时间作相应调整。 3.错综时间虚拟条件句 1. If t ... ...
