（广东版）开心英语六年级下册课件
Unit 11    We have to go to India!
动词时态和短语运用
动词的过去式
lose                      lost
find                       found
carry                    carried
forget                   forgot
动词的过去式
look                 looked
worked             saved
help                  helped
play                   played
wash                 washed
规则变化加(e)d
cost                 cost cut                   cut hit                    hit

hurt                 hurt let                   let                                 must               must put                  put                                 set                  set shut                shut read                read
不规则变化（同形）
bring          brought buy            bought
think          thought               catch         caught teach         taught build          built                      lend           lent                       send          sent
情态动词 must，have to，
have got to 的用法
你       去睡一觉。


2. 你           邀请他。


3. 你           照你父母的话办。


4. 你           抽这么多的烟。
You’d better get some sleep.
You’d better not invite him.
You should do what your parents tell you.
You oughtn’t to smoke so much.
最好
最好不
应该
不应该
必须
不许
不得不
不必要
You must get some sleep.
You mustn’t invite him.
You have to do what your parents tell you.
You haven’t got to smoke so much.
Model verbs (Ⅱ)
must
have to
have got to
must not / mustn’t
don’t  have to
haven’t got to / hasn’t got to
Must sb…?
Do / Does sb. have to …?
Have / Has sb. to …?
（必须、应当）
（必须、不得不）
have to和have got to 的用法
have to 由have + to组成。因此具有have的各种时态。
     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. 在口语中，have got to 也可以表示义务和需要， 与have to 基本同义。
     He has got to go right now.
     He hasn’t got to go just yet.
must和have to的区别
含义不同：
     must 表示说话人的主观思想，强调个人意志和主观的决心。
     have to侧重于客观上的必要，强调客观条件作用的结果。
     You must do it now.
     I have to go now.
3.  否定含义不同
       在否定句中, have to表示不需要，must则表示不允许。
       You don’t have to go there.
       You mustn’t go there.
2. 适用时态不同
       must 只能用于一般现在时和一般过去时，（在间接引语中）
       have to 可用于更多的场合。
       She said she must do well in her English.
Exercises
Don’t be late again. You ____ be here on time.
     A.  may        B.  can           C.  must        D.  needn’t
You ___ do it even if you don’t want to.
     A.  can’t       B.  mustn’t    C.  needn’t    D.  have to
3. —— Must I take a bus?
    —— No, you ___. You can walk from here.
     A. mustn’t                     B. don’t   
     C. don ‘t have to          D. had better not to
4. —— It is rather cold here. Shall we light a fire?
    —— No, we ___, because things here are easy to catch fire.
     A.  won’t       B.  can’t      C.  mustn’t       D. needn’t
See you .