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’t have done表示本不該干某事而干了 。 (表意愿) (表許可) shall和 should: 1. Perhaps I shall pay a visit to England this 。t you sit down? 請坐下,好嗎? 疑問句中用于第二人稱,提出請求 3. _____________________________________ Fish will die out of water. When I was at school, I would ask such questions. 表示習慣和傾向性 “總是” 4. _________________________ Would you help us, please? 請您幫助我們,好嗎? Yes , I will. 好的,我愿意。m here? 請您告訴她說我在這兒,好嗎 ? (助動詞) (情態(tài)動詞) will是助動詞或是情態(tài)動詞 用于構成將來時是助動詞。t /couldn’t have gone out because the light is still on. Can (Could) he have heard the news? can /could have done 過去否定或疑問的猜測 Given more time, I could have done it even better. I could have lent him money, but he didn’t ask me. could have done 表示虛擬語氣,用于肯定句。 2. 適用于主語的各種人稱和數 ( have to 例外 ) 3. 后面接動詞原形,即不帶 to 的不定式 ( have to , used to , ought to 本身帶有 to ) 4. 具有助動詞的作用, 既可用來構成否定句 疑問句及簡明答語。Modal Verbs 情態(tài)動詞 情態(tài)動詞用來表示說話人對一個動作或狀態(tài) 的 看法 , 態(tài)度 或者說話人的 情感 。 情態(tài)動詞用法的特征: 1. 有一定的詞義,但不能單獨使用作謂語。 . The man still was able to get to the village though there was so much trouble. E. _____________: eg. Can the news be true? It can’t be true. 表示推測可能性 只用于疑問句和 否定句 2) could的主要用法是: A. ______________________________ ____________________: eg. We all knew that the young man couldn’t be a doctor. could 是 can的過去式 , 表示過去 的能力和推測 B. could可代替 can表示請求 , 語氣委婉 eg. Could I use your bike? Yes, you can. C. ________________________________________