[情态动词]能够可以做某事:
Most birds can fly,but some can't .You can stay the night,if you like. Chocolate can be addictive.
语法结构
1 can/can't | + 不带to的不定式
Eric can speak five languages.
Can you ski?~No ,I can't.
表示做某事的能力。
Doing grammar exercises can be boring.
Madrid can be very cold in winter.
表示有时会发生某事，表示可能性。
It can't be five o'clock already,surely?
He can't be French:he hasn't got a French accent.
表示你认为某事是不大可能或不可能的。
Can I use your hairdryer?
You can go into the mosque but you can't take photos.
表示请求、给予或拒绝许可
Can I help you with that ?
I can do the shopping, if you like .
表示提议
2 can't | + have | + 过去分词
Andrew can't have left: his coat's still here.
Judging by her Italian,she can't have lived in Italy very long.
表示某事是不可能生生的。
搭配
can/can't经常跟感官动词如see,hear,smell,feel等搭配，用来表示借助感觉器官
知道某事现在正在发生：
I can hear someone playing music in the next apartment.
Can you see that bird? It looks like a finch.
Dose that hurt?~No,I can't feel a thing.
can/can't 也跟认知动词如imagine,believe,understand等搭配使用
I can't imagine what's happened to Ted.
Can you believe it ? Mary wants to go back to New Zealand.
固定短语
'I can't tell you how ...'我简直无法形容...
I can't tell you how relieved I was when they all left.
表达强烈的感情
'I can't believe (it)!' 我真不敢相信(它)!
Cathy! I can't believe it .What are you doing here?
I can't believe how much the boys have grown.
表示惊讶
Who can that be ?会是谁呢?
There's the phone.~Who can that be, at this time of night?
询问不速之客、陌生电话等。