Unit 2 Healthy Eating
Grammar
1. 带 have to 时，附加疑问用 do 或 have的相应形式 , 用 do 更常见。
You don’t have to go to school on Sundays , do you ?
We have to work today , don’t we ? (haven’t we ?)
2. 在由“祈使句+附加疑问”构成的附加疑问句中，附加疑问部分一般用 will you, won’t you, would you,有时也可用can you, can’t you, why don’t you, could you等。如：
　
Don’t open the door, will you? 　

Give me some cigarettes, can you?
　
Take a rest, why don’t you?
3. 以let’s开头的祈使句，附加疑问部分用shall we
以let us开头的祈使句，疑问部分用will you。如：
Let’s have a basketball match this afternoon,shall we?
Let us go out for a rest, will you?
4. 带 must时
A 表示“必须”，附加疑问部分用 mustn’t
We must work hard , mustn’t we ?
B 表示“有必要”时，附加疑问部分用 needn’t.
The teacher must show concern for each pupil , needn’t he ?
C 表示“推测”时，附加疑问部分要与陈述部分的谓语动词相呼应。
He must be a teacher, isn’t he ?
You must be tired, aren’t you?
D must + have + done 是对过去情况的推测，当陈述部分没有明确的表示过去的时间状语时，附加疑问要用have的相应形式；当陈述部分有明确的过去时间状语时，附加疑问要用过去时。
You must have lived here for a long time , haven’t you ?
You must have seen him yesterday , didn’t you ?
E 当陈述部分是 must not , 表示“一定不要” 、“禁止”时，附加疑问除用must 外，还可以用may.
I must not tell him , must I ? ( may I ?)
5．当陈述部分含有情态动词used to时，疑问部
分可用 usedn’t 或didn’t。如：
The old man used to smoke, didn’t he?
或 usedn’t he?
　 Tom used to live here, usedn’t he?
或didn’t he?
6. 当陈述部分带有情态动词ought to时，疑问
部分用 oughtn’t 或 shouldn’t。如：
　　He ought to know the answer, oughtn’t he?
　　We ought to read this book, oughtn’t we?
或shouldn’t we?
6. 带need 时，附加疑问用 do 或 need ,应该与陈述部分 need 用法相呼应。
I needn’t tell you the answer , need I ?
You need to buy a better dictionary , don’t you ?
He used to leave in London,

There used to be a cinema here before the war,
反义疑问句
usedn't he/didn't he?
usedn't there/didn't there?
Such things ought not to be allowed,
He ought to be punished,

We ought to go,
反义疑问句
ought they?
oughtn't he?
ought we not?
should we not/shouldn't we?
We need to do it,
You daren’t go there,
You must go home right now,

You mustn’t walk on the grass,
反义疑问句
don't we?
dare you?
needn't you?
mustn't you?
You must be tired,
He must have met her yesterday,

You must have seen the film,
反义疑问句
aren't you?
didn't he?
haven't you?
完成下列反意疑问句
1. We must go at once, ___________?
2. My uncle used to smoke, __________________?
3. She must be a music lover, _________?
4. Please turn down the radio, _________?
5. Let us do the jobs ourselves, _______________?
6. There were few people there, ___________?
7. You need to have a good dictionary,_________?
8. You must have seen her yesterday, _________?
9. If anybody comes here, he will be welcome,
__________?
10. There used to be an old stone bridge across
the river, _________________________?
needn’t we
didn’t he/usedn’t he
isn’t she
will you
will you/won’t you
weren’t there
don’t you
didn’t you
won’t he
didn’t there/usedn’t there