情態(tài)動詞must,have_to,have_got_to的用法.ppt

1、太原育英中學(xué) 夏冰,情態(tài)動詞 must，haveto，have got to 的用法,你 去睡一覺。 2. 你 邀請他。 3. 你 照你父母的話辦。 4. 你 抽這么多的煙。,Youd better get some sleep.,Youd better not invite him.,You should do what your parents tell you.,You oughtnt to smoke so much.,最好,最好不,應(yīng)該,不應(yīng)該,必須,不許,不得不,不必要,You must get some sleep.,You mustnt invite him.,You have

2、 to do what your parents tell you.,You havent got to smoke so much.,Model verbs (),must,have to,have got to,must not / mustnt,dont have to,havent got to / hasnt got to,Must sb?,Do / Does sb. have to ?,Have / Has sb. to ?,（必須、應(yīng)當(dāng)）,（必須、不得不）,表示義務(wù)、命令或必要，后面接不還to的動詞學(xué)定式。 Soldiers must obey orders. We must k

3、eep our word. 2. must 用在否定句結(jié)構(gòu)中表示“不允許、禁止” He must not leave his room. You mustnt smoke in the office. 3. must用在一般疑問句中，肯定回答用must，否定回答用neednt 或dont have to Must I hand it in before five? No, you _. Yes, you _.,you neednt. / dont have to,you must,must的用法,have to和have got to 的用法,have to 由have + to組成。因此具有

4、have的各種時態(tài)。 He is an invalid and has to have a nurse. She knew what she had to do. I shall have to reconsider my position. He is always having to exercise judement. 2. 在口語中，have got to 也可以表示義務(wù)和需要， 與have to 基本同義。 He has got to go right now. He hasnt got to go just yet.,must和have to的區(qū)別,含義不同： must 表示說話人

5、的主觀思想，強(qiáng)調(diào)個人意志和主觀的決心。 have to側(cè)重于客觀上的必要，強(qiáng)調(diào)客觀條件作用的結(jié)果。 You must do it now. I have to go now.,3. 否定含義不同 在否定句中, have to表示不需要，must則表示不允許。 You dont have to go there. You mustnt go there.,2. 適用時態(tài)不同 must 只能用于一般現(xiàn)在時和一般過去時，（在間接引語中） have to 可用于更多的場合。 She said she must do well in her English.,Exercises,Dont be late again. You _ be here on time. A. may B. can C. must D. neednt You _ do it even if you dont want to. A. cant B. mustnt C. neednt D. have to 3. Must I take a bus? No, you _. You can walk from here. A. mustnt B. dont C. don t have to D. had better not to 4. It is rather cold here. Shall we light a fi