情态动词用法-Tibby.pptVIP

7.need 情态动词 含义 否定式 注意点 need 作情态动词 “需要” needn’t “不必” need+ 动词原形 作实义动词“需要” don’t /doesn’t need “不需要” need+ to do --- Need he start from the beginning? --- Yes, he must. --- No, he needn’t/doesn’t have to. 1.作情态动词时,仅用于否定或疑问句,后接动词原形,表“需要” need用法讲解 You needn’t return the book now. 2.作实义动词时,表示“需要”，有人称、时态、和数的变化 He needs to finish it this evening. The classroom needs cleaning. 用need /shall/must提问时， 肯定回答为 must， 否定回答为 needn’t或don’t(doesn’t) have to。 Tips 对need问句的回答: --Need I finish the work today? --Yes, ________________. No, ________________. No, ________________. you must you needn’t you don’t have to 对其它情态动词的回答: --Shall I tell John about it? --No, you __________. --No, you __________. --Must we do it now? --No, you __________. --No, you __________. needn’t don’t have to needn’t don’t have to 情态动词 含义 否定式 had better 最好 had better not“最好不要” 8.had better I. Try to explain the meanings of the modal verbs in the following sentences. 1.He can speak English well. 2.You can go home now. 3.That can’t be true. 4.Could you please show me the way to Beihai Park? 5.They hunters are lost. They could starve. 6. May I come in? 7. He may give you some help? ability permission guessing request possibility permission possibility 8.Don’t worry. I will help you. 9.Often he would dress up like a rich man. 10.Would you like to join us for dinner? You shall have the ticket as soon as I get it. You should arrive at the airport two hours before he goes. It is five o’clock. He should turn up soon. Wang Feng wins an award every year. He must be strong. promise past habit request promise prediction advice speculation 2. 用情态动词完成句子 1).You’ve been working all day. You______ be very tired. 2).(The doorbell rings) I wonder who that is. It ______ be Lisa. She’s still in the library at this time. 3).It is a long time since we met last time.