定語從句

（二）對現在的事實進行推測： 主要結構：…must / may / might +動詞原形                              be+名詞/形容詞/介詞短語                              be + doing 例句： 1. you must be jeanne. i’m mathilde loisel. we used to know each other very well.    2. they must be in bed already at this time of the night. 3. the teacher must be joking. 4. freda isn’t in class. she must be sick. 5. there must be something wrong. 6. she might be very clever, but she hasn’t got much common sense. 7. he may be arriving this evening. 8. he may be traveling around the world. 9. the keys can’t be in the room. i have just searched it very carefully. 10. can the news be true ? （三）對過去的事實進行推測：結構：情態動詞+have done / been+名詞/形容詞/介詞短語 例句： 1. mrs. longmans must have been a pretty girl in her youth. 2. he couldn’t have seen anna yesterday. she’s gone abroad. 3. i think i must have left my glasses in the library. 4. he might have overslept again. 5. where can tom have gone ? 情態動詞表達虛擬語氣：表達“本來…”，“不然早就…”。這是情態動詞的一種虛擬語氣用法。表示說話人所講的與所發生的事實相反。表達了說話人的埋怨，后悔的語氣。其結構是在一些情態動詞后面加 have done 結構。根據要表達的意思，有如下結構： should have done / ought to have done：本應該…… shouldn’t have done / oughtn’t to have done：本不該…… could have done：本來可以…… needn’t have done：本來沒必要…… would like to have done：本來很想…… would rather not have done: 本來不愿意…… could / might / have done: 不然早就…… 例句： 1. you shouldn’t have laughed at his mistakes. 2. you could have told us earlier. 3. i ought to have bought that dictionary last week. 4. you ought not to have spent so much time in reading novels. 5. we need not have been in a tearing hurry to catch the train. 6. they would like to have seen that film last film. 7. if he had given me his number, i could have telephoned him. 8. they might have been frozen to death but for the rescue in time. 知識難點： 某些情態動詞的特殊用法： need 和dare 的兩種形式的用法need 和dare可以用做實義動詞，后面接不定式（to do）結構，在疑問句和否定句中，加助動詞do/does/did/或don’t/doesn’t/didn’t。作為情態動詞使用時，主要用于疑問句和否定句中。情態動詞needn’t（沒有必要，不必）相當于don’t have to 例句： 1. it is cold, you need to wear some warm clothes. 2. need i stay here with you for a while ?   thank you, you needn’t. 3. how dare you speak to parents like that ? 注意： 句型i dare say+從句。 意思是：我肯定…… = i’m sure或there is no doubt that+從句。 例句： i dare say that my uncle will get the money if i die. will和would