助動詞與情態(tài)動詞-講解及練習題-免費閱讀
【正文】 t C. needn39。t you11. You must have seen him off yesterday, _________? A. haven39。t we C. do we D. shall we4. He was a good swimmer so he _________ swim to the river bank when the boat sank. A. could B. might C. should D. was able to5. I went to the doctor39。注意，在美國英語中ought to 用于否定和疑問句時to可以省略。t (don39。如： May I use this dictionary? Yes, please. 或 Certainly. 在請求對方許可時，如果Might I…? 就比用May I…? 語氣更婉轉(zhuǎn)些，如：May I have a look at your new puter? 但是表示“阻止”或“禁止”對方做某事時，要用must not代替may not，如： May we swim in this lake? No, you mustn’t. It’s too dangerous. （2）may或 might都可以表示可能性，表示“或許”、“可能”之意，如果用might表示可能性，則語氣更加不肯定，如：They may (might) be in the library now .must的基本用法（1）must表示“必須”、“應該”之意，其否定式 must not，縮寫形式為 mustn39。情態(tài)動詞沒有人稱和數(shù)的變化。have (has, had)(1)“have+過去分詞”構成完成時態(tài)。助動詞與情態(tài)動詞一、助動詞助動詞有be, have, do, will, shall。如：Have you seen the film ? (2)“have been + ing”構成完成進行時態(tài)。但不能單獨作謂語動詞用，必須在其后面接動詞原形構成謂語動詞。t，表示“不應該”，“不準”、“不許可”或“禁止”之意，如：We must study hard and make progress every day. You mustn39。t have to), but you must finish it in three days. （3）在肯定句中must可以表示推測，表示“一定”或“必定”之意，如： Whose new bike can it be? It must be Liu Dong39。例如：Ought you smoke so much? You oughtn’t smoke so much.dare的基本用法（1）dare (dared為其過去式) 作情態(tài)動詞用時，主要用于否定句，疑問句和條件從句中，如：Dared he bread the traffic regulations again? （2）在現(xiàn)代英語中dare常用作行為動詞，其變化與一般行為動詞相同，如：She dares to stay at home alone at night.need的基本用法（1）need作情態(tài)動詞用時，主要用于否定句和疑問句中，如：He needn39。s yesterday, I had to wait for half an hour before he ________ see me. A. can B. may C. might D. could6. _________ this book be yours? No, it ________ not be mine. It ________ be his. A. Can, must, may B. May, might, must C. Can, may,
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