A1 to be able to能,会
used to say that you can and will do something可以,行,好
More examples
I don't know how he can afford a new car on his salary.
Cats can see in the dark.
The water's not deep here - look, I can touch the bottom.
I doubt whether I can finish the work on time.
Computers can perform millions of calculations every second.
A1 to be allowed to(表示许可)可以,能
informal sometimes used to tell someone angrily to do something(生气地命令某人)必须,得
More examples
If you finish early you can go home.
She can come whenever she likes, as far as I'm concerned.
Finish up your dinner and you can have dessert.
How early can you get off this afternoon?
Anyone can go - you don't have to be invited.
A1 used to request something(用于请求)能,可以
More examples
I can't get the cork out of the bottle - can you try?
Excuse me, can I just get past?
It's freezing in here - can I close the window?
Please can I have a go on your bike?
Andrew, can you help me install this software?
A2 used to express possibility(表示可能性)可以,能,会
More examples
Couples who are childless can feel excluded from the rest of society.
Children can choke on peanuts.
Clearance of a cheque can take up to a week.
You can get travel concessions if you are under 26.
Not making a will can have serious consequences for the people you might wish to benefit.
A1 used in polite offers of help(用于礼貌地提出帮忙)可以,能
More examples
Is there anything I can do to help?
You can go instead of me, if you want.
You look lost - can I help you?
What a lot of bags! Can I carry something for you?
"If you like I can do some shopping for you." "That's a very kind offer."
A2 [ C ] also tin can, UK also tin a closed metal container, especially cylinder-shaped, in which some types of drink and food are sold(尤指圆柱形的)罐,筒,听
[ C ] UK also tin the amount of food or drink that is contained in a can一罐的量
[ C ] UK also tin a metal container, especially one with a lid, handle, and shaped opening for pouring(尤指带盖和把的)金属罐
noun
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