could
动词
定义 could 动词
ability
- A2
The past tense of "can," indicating the ability or permission to do something.
In my youth, I could stay awake all night without feeling tired.
It was so loud that we couldn't even hear ourselves talk.
You mentioned that we could watch television after finishing our homework.
情态动词
定义 could 情态动词
permission
- B1
Used to politely request permission, more formal than "can".
Could I please have a word with Mr. Davis?
Excuse me, could I interject for a moment?
Could I borrow your pen for a second?
request
- A2
Used to politely request someone to provide something or perform an action, more courteous than "can".
Could you possibly lend me five pounds?
Could you please lower the volume of the music?
Could you assist me with opening the door?
possibility
- B1
Expressing a slight or uncertain possibility.
Many criminal activities could be prevented with the right measures.
She could be arriving at any minute now.
This new research could lead to a breakthrough in the treatment of this disease.
suggestion
- B1
Used to offer a suggestion.
If you're free, we could grab a drink after work tomorrow.
You could always give Susie a call and see if she's available to watch the children.
Perhaps we could try a different route.
expectation
Used to express dissatisfaction, often with anger, about what someone should do.
Well, you could at least try to seem a bit more enthusiastic!
I have been waiting for ages – you could have told me you weren't coming!
You could apologize for your behavior!
成语
- could do with something
To need or benefit greatly from something.
• This office could do with a good tidy-up.