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我帮你做好了！才纳我啊！ 我找了两种，你看你要哪种？ 第二种在13页！ （一）情态动词一．情态动词的现在完成式的用法??? 情态动词现在完成式主要有两个功能：表示已经发生的情况和表示虚拟语气。在这两个方面must/mustn’t,;can/cann’t;need/needn’t;may/mayn’t;might/mightn’t;should/shouldn’t;ougtht等情态动词＋完成式表示的意思是有一定区别的1．表示已经发生的情况。1）must have+过去分词，表示对已发生情况的肯定推测，译为“（昨天）一定……”。如：My pain?????????? apparent the moment I walked into the room, for the first man I met asked sympathetically:” Are you feeling all right?”[A] must be?????? [B] had been???? [C] must have been???? [D] had to be（答案为C）2）can’t / couldn’t have+过去分词，表示对已发生情况的否定推测，译为“（昨天）一定没……”。如：Mary???????? my letter; otherwise she would have replied before now.[A] couldn’t have received???? [B] ought to have received[C] has received???? [D] shouldn’t have received（答案为A）3）may / might have +过去分词，表示对已发生的事情做不肯定、可能性很小的推测，或事实上根本没发生，译为“也许……”。如：At Florida Power’s Crystal River plant, a potentially serious leakage of radioactive water may have been unknowingly caused by an electrician.2．表示虚拟语气。1) needn’t have + 过去分词，表示做了不必做的事，相当于”didn’t need to do”,译为“其实没必要……”。如：You needn’t have come over yourself.As it turned out to be a small house party, we???????? so formally.[A] needn’t dress up???????? [B]did not need have dressed up[C] did not need dress up???? [D] needn’t have dressed up(没有必要穿的那么正式，体现是说话者的建议，实际结果是否真的穿的很正式没有确定，答案为D)2）should have +过去分词，表示应该做某事但实际上未做，译为“本应该……”should not + have过去分词表示本不应该做某事但实际上做了，译为“本不应该……”。如：I regret having left the work unfinished; I should have planned everything ahead carefully.我本来应该事先认真地把每件事情规划的很好，但实际上作者还是没有规划好，以至工作没有完成。3) ought to have +过去分词，表示动作按理该发生了，但实际上未发生，译为“该……”，与should 的完成式含义类似。如：Ｔhe porter ought to have called the fire-brigade as soon as he saw the fire in the stock, which went up in smoke .4) could have +过去分词，表示过去本来可以做但却未做，译为“完全可以……”。这点与ought/should/ have +过去分词用法相似。如：What you said is right, but you could have phrased it more tactfully.5) may/ might have +过去分词，表示过去可以做但实际未做，译为“（那样）也许会……”。如：It might have been better to include more punchy statistics and photos of equipm