第1个回答 2015-03-09
I can see a horse.
can是情态动词，基本含义表示能力（可能表示技能、体能或可能），相当于be able to，但是它的将来时和完成时必须要用be able to的结构（在状语从句中可以用can表示将来，即主将从现）。过去时was/were able to可以表示经过努力而成功地办到了某个具体的事情。它的否定式是cannot或can't。
Can you type? =Are you able to type?
Can you come to the meeting tomorrow?
You can go with him next Sunday.
If you can pass the exam tomorrow morning, I'll buy you a gift.
She couldn't climb the mountain? = She wasn't able to climb the mountain.
You will be able to swim soon.
I haven't been able to recall his name.
He said that he hadn't been able to fix my computer the day before.
She asked him whether he would be able to jump over the stream.
A single spark can sttart a prairie fire.
can可以表示可能，用在疑问句或否定句中。
Can it be true?
Can she be living there?
Can the hall seat a thousand people?
What can satisfly her?
How could I know?
I couldn't help laughing at the way that he pronounced the sound /r/.
can也可以表示许可，用在非正式场合，如：
Mother said we could do anything we wished.
can后面可以接副词possibly，表示可能或可以。
I can't possibly do it.
与情态动词、联系动词、非谓语动词连用时，要用be able to。
She might be able to play the role.
I seem not to be able to get any sleep at nights.
He regretted not being able to speak English.
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