Excuse me. Where is the zoo? -Sorry, I don’t know. Ask that policeman. He _____ know.A. shall B. may C. need D. would为什么是B

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Excuse me. Where is the zoo? -Sorry, I don’t know. Ask that policeman. He _____ know.A. shall B. may C. need D. would为什么是B
Excuse me. Where is the zoo? -Sorry, I don’t know. Ask that policeman. He _____ know.
A. shall B. may C. need D. would
为什么是B

Excuse me. Where is the zoo? -Sorry, I don’t know. Ask that policeman. He _____ know.A. shall B. may C. need D. would为什么是B
shall “应该”,常用于祈使句.
may “可能,或许”,表示判断
need “需要”
would“将要,肯能,打算”表示意愿
在这个句子中表示判断,意思是“他或许知道”

这句话的意思是,请问动物园在哪里?对不起,我不知道,他或许知道。 may在这里是可能、或许的意思。

表可能性 且may所表示的可能性是较小的可能性

同样是情态动词,这四个词用法不一样,此处主要意思是,他也许知道,用may。几个词的具体用法如下:
Shall 1)用于第一,第三人称,表征求意见或建议
Shall we go out for lunch ?
2) 用于第二,第三人称陈述句,表示一种强烈的感情:如命令,警告,禁止,威胁,允诺等语气
If you dare do that , you shall be...

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同样是情态动词,这四个词用法不一样,此处主要意思是,他也许知道,用may。几个词的具体用法如下:
Shall 1)用于第一,第三人称,表征求意见或建议
Shall we go out for lunch ?
2) 用于第二,第三人称陈述句,表示一种强烈的感情:如命令,警告,禁止,威胁,允诺等语气
If you dare do that , you shall be punished .
3) 表示规章,指示,预言等
All shall die
May /might
1)表许可或征求对方的许可,有“可以”的意思
You may go now
May I use your computer ?
注:过去式might 表示的语气更加委婉,客气
Might I use your pen for a while ?
回答以may 开头的疑问句有如下表达法:
May I smoke here ?
---------Yes , you may. No, you can’t.
---------Yes, please. No, you mustn’t
No, you’d better not.
2)表猜测,通常只用于陈述句。
You may be right.
在口语中can 可以代替may 表示许可,但can较随便,may 更正式
Can I use your bike ,John?
May I have a look at your license please,sir ?
Need /Dare
1)need 表示“需要,必须”,作情态动词时,仅用在否定句和疑问句中,在肯定句中一般用must , have to , ought to , should 代替
You needn’t worry
Need you go ?
No , I needn’t .
Yes I must.
2)dare作情态动词时,主要用于疑问句,否定句和条件从句中,一般不用在肯定句中。
How dare you say I’m unfair ?
He daren’t speak English before such a crowd , dare he ?
3) dare和need 常用作实义动词,有时态,人称和数的变化。所不同的是,作实义动词时,在肯定句中,dare后面通常接带to 的不定式,在否定句和疑问中,dare后面可接带to 或不带to的不定式。
I dare to swim across this river .
He does not dare (to) answer .
Don’t you dare (to) touch it !
He needs to finish it this evening .
Will / Would
Will 1)表意愿
I will help you .
2)用于第二人称征求意见
Will you have some more wine ?
3)用于第三人称表推测
-------Somebody is coming upstairs
-------That will be Mary.
4)表将来或现在的习惯
He will come this afternoon
The old man will sit by the window for hours.
Would 1) 表过去的意愿
I’d like to see Mr. Smith
2)表过去的习惯
When I was a child , we would get up early and go climbing .
3)表征求意见,语气比will 委婉
Would you mind my smoking here ?

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