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Grammar1情态动词..doc

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can ,could
(can指一般或现在的能力 could指过去的能力)
Eg:He can speak several languages.
She could sing well when she was seven be able to.
注意: was able to(=eed in doing = manage to do)指过去设法做成某事,常表过去能力少指一般或现在
Eg:The fire spread quickly and fortunately everyone was able to get out.
I talked with her for a long time, and finally I was able to make him believe me.
(与may同义) 表情求时could比can更委婉,但回答时要用can
can比could更肯定
Eg:-Who can it be ?
-He may be our headteacher.
-It can’t be him. He has gone to the meeting.
“有时会”或“有时候”
Eg:He can be very friendly at times.
It can be very cold here, even in Spring. (1)can not + V.(原形)+ too + adj./adv. 再……也不过分;越……越好
Eg:You can’t cross the road too carefully. 过马路再小心也不过分。
You can’t memorize words too many. 单词记得越多越好。
(2)can’t help doing sth. 情不自禁做某事;忍不住做某事
can’t help do 不能帮助做……
can’t help but do sth. =can’t but do =can’t choose but do=can’t but do不能不做某事;只能做某事
may, might
( might 表过去的允许较 might 表请求语气委婉)
Eg:-May I take the book out ?
-Yes, you may./No, you can’t./…
(可能性:can>could>may>might)
Eg:He may be getting ready for his trip.
(不能用might仅用may)
Eg:May you eed. 祝你成功
May god bless you. 愿上帝保佑你(1)may/might as well do = had better do sth. 最好做某事
(2)may well do sth. 或许…
must , have to
(mustn’t表禁止,不许);have to 表客观
Eg:-Must I clean th

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