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How to use Can / Could

Can :
Can is used to show power, ability, capacity
subject +can +verb in the present tense

Example:
To tell Ability/ capacity

She can dance.
They can do it.
You can play.
We can speak English.
She can dance

To make negative with can

He cannot read.
You cannot play

possibility

It can rain today.
It can train today.
He can win this competition.

Interrogative

Can I go?
Can I go to movie?

To give permission

Yes you can go.
No, you can go.

Can in short form

Can you help me?
Can you read? No I couldn?t I can?t.

Uncertainty of past

He can have reached by now.
He can have heard the news by now
She can have sold her jewelry.

Uses of Could

"Could" is also used to show power/ability/capacity
Could is past form of can.
Ability

He could read.
He could play.
She could dance.
In my younger days could run miles at a stretch.

Negative

she could not dance.
She couldn?t sing.
They couldn?t/could not play.

Interrogative

Could you lend me your book?
Why couldn?t you finish you work in time?
Could I have a cup of coffee?
Could you please take me to the owner of this clinic?
Could you give me a lift by your car?

Possibility

She could pass if she worked hard.
I could have helped him if he had told me.
I could h he could have passed the examination.
He could have avoided that fight.
I could have believed in him.
I could have buy car if I had money

Indirect narrations

She asked me if I could help her.
He said that he could not go there.

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