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BNC: 55 COCA: 71
couldverbukstrong /kʊd/ weak /kəd/ usstrong /kʊd/ weak /kəd/

could verb CAN

A2 past simple of "can", used to talk about what someone or something was able or allowed to do（can 的过去式，表示能够或允许）能，可以

When I was younger I could stay up all night and not get tired.我年轻时，一通宵不睡觉都不觉得累。
It was so noisy that we couldn't hear ourselves speak.太吵了，我们连自己说话都听不见。
You said we could watch TV when we finished our homework.你说过我们完成家庭作业后可以看电视。
We asked if the computer could access the internet.我们询问这台计算机能否上网。

More examples

She walked off before I could say anything.

I could never have achieved this without the encouragement of my husband and family.

I could see by the look on their faces that something was wrong.

I wish I could find (the) time to do more reading.

Even when you win a match you always feel you could have played better.

couldmodal verbukstrong /kʊd/ /kəd/ us/kʊd/ /kəd/

could modal verb PERMISSION

B1 used as a more polite form of "can" when asking for permission（礼貌地请求许可，比用can更加有礼貌）可以，能

Could I speak to Mr Davis, please?我可以和戴维斯先生通话吗？
Excuse me, could I just say something?对不起，我可以讲几句话吗？

More examples

Could I borrow your pen?

Could we see her now, please?

Could I have some more pudding?

Could I use your bathroom, please?

Could I leave the children with you this morning?

could modal verb REQUEST

A2 used as a more polite form of "can" when asking someone to provide something or do something（礼貌地请求提供某物或做某事，比用can更加有礼貌）能，可以

Could you lend me £5?你能借我5英镑吗？
Could you turn that music down a little, please?你能把音乐声调低一点吗？

More examples

Please could you explain why you're so late.

I'm frozen - could you close the window?

I've got rather a full week next week - could we postpone our meeting?

If you could get that report finished by Thursday I'd be very grateful.

Ben, could you hand round the biscuits?

could modal verb POSSIBILITY

B1 used to express possibility, especially slight or uncertain possibility（尤用于表示微小或不确定的可能性）可以，能，也许

A lot of crime could be prevented.许多犯罪活动是可以防止的。
She could arrive anytime now.她现在随时会到。
This new drug could be an important step in the fight against cancer.这种新药可能是攻克癌症过程中迈出的重要一步。
Be careful with that stick - you could have hit your sister!留心那根棍子——你差点打到你妹妹！

More examples

Passengers could face long delays.

The temperature could fall below zero overnight.

You could be the Queen of England, for all I care - you're not coming in here without a ticket.

Anything could happen in the next half hour.

It is not inconceivable that she could be lying.

could modal verb SUGGESTION

B1 used for making a suggestion（用于提出建议）可以，能

We could go out for a drink after work tomorrow, if you want.要是你愿意，明天我们下班后可以去喝上一杯。
You could always call Susie and see if she will babysit.你随时可以给苏茜打电话，看看她能否帮你照看孩子。

More examples

You could offer to buy her a new one.

Could you get a bigger house?

We could try mending it with glue.

I could look after Toby for you.

We could have lunch one day.

could modal verb SHOULD

used for saying, especially angrily, what you think someone else should do（尤指生气地对某人表示不满）应该

Well, you could try to look a little more enthusiastic!喂，你应该表现得热心一点！
I waited ages for you - you could have said that you weren't coming!我等了你很久——你应该提前说一声你不来！

Idiom(s)

could do with sth
BNC: 55 COCA: 71
BNC: 55 COCA: 71
BNC: 55 COCA: 71
could
Irregular past tenses: arose, ate, awoke...
Modal verbs: can, cannot, could...
Ways of making a suggestion: perhaps, maybe, may...
Ways of emphasizing when you are annoyed or angry: hell, blast, for heaven's sake/sakes...

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