We use the modal can to make general statements about what is possible:

It can be very cold in winter. (= It is sometimes very cold in winter)
You can easily lose your way in the dark. (= People often lose their way in the dark)

We use could as the past tense of can:

It could be very cold in winter. (=Sometimes it was very cold in winter.)
You could lose your way in the dark. (=People often lost their way in the dark)

We use could to show that something is possible in the future, but not certain:

If we don’t hurry we could be late. (=Perhaps/Maybe we will be late)

We use could have to show that something is/was possible now or at some time in the past:

It’s ten o’clock. They could have arrived now.
They could have arrived hours ago.


We use the negative can’t or cannot to show that something is impossible:

That can’t be true.
You cannot be serious.

We use couldn’t/could not to talk about the past:

We knew it could not be true.
He was obviously joking. He could not be serious.


We use can to talk about someone’s skill or general abilities:

She can speak several languages.
He can swim like a fish.
They can’t dance very well.

We use can to talk about the ability to do something at a given time in the present or future:

You can make a lot of money if you are lucky.
Help. I can’t breathe.
They can run but they can’t hide.

We use could to talk about past time:

She could speak several languages.
They couldn’t dance very well.



We use can to ask for permission to do something:

Can I ask a question, please?
Can we go home now?

could is more formal and polite than can:

Could I ask a question please?
Could we go home now?

We use can to give permission:

You can go home now if you like.
You can borrow my pen if you like.

We use can to say that someone has permission to do something:

We can go out whenever we want.
Students can travel free.

Instructions and requests:

We use could you and as a polite way of telling or asking someone to do something:

Could you take a message please?
Could I have my bill please?

can is less polite:

Can you take a message please?

Offers and invitations:

We use can I … to make offers:

Can I help you?
Can I do that for you?

We sometimes say I can ... or I could ... to make an offer:

I can do that for you if you like.
I can give you a lift to the station.





Which is correct?

-I'm not sure if I can bring....
-I'm not sure if I could bring....

Hello mayallen,

Both can be correct - it depends on the context. In general, you'd probably use 'can' for a situation you see as likely or possible and 'could' for a less likely situation - but again, it really depends on the context. If you want to explain it a bit more, we can help you with a specific context.

All the best,
The LearnEnglish Team

I have read "solar power could become the cheapest power"
what exactly the sentence mean? Is it correct to replace COULD with will? pls explain. i give the link for your reference.

Hello dharanikanth,

As is explained above,

We use could to show that something is possible in the future, but not certain.

That is the meaning in the sentence you ask about. You could replace 'could' with 'will' to, for example, make a prediction. See our talking about the future page for more on the different uses of 'will'.

All the best,
The LearnEnglish Team

what is the difference between can & can be or could & could be?

You can easily lose your way in the dark or
You can be easily lose your way in the dark.

Hello mknm,

After 'can' we use a verb in the base form (the infinitive without 'to').

'Can be' is just the verb 'be' used after 'can'. It has no special meaning beyond this.

The sentence 'You can be easily lose your way...' is not correct. You would need to say 'You can easily lose your way...'


Best wishes,


The LearnEnglish Team

What is the difference between the following:

I can go for a movie.
I could go for a movie?

Hello neh7272,

The ways in which 'can' and 'could' are used are on this page. However, which are relevant in this example depends upon the context. You could be talking about ability or possibility, you could be making a suggestion, you could be making an offer - it is impossible to identify the intended meaning from the sentences without any context.

If you tell us what you want to say - the intended meaning - then we can tell you how you might do it.


Best wishes,


The LearnEnglish Team

Hello Mr.Kirk & Mr. Peter, I hope you are doing great.

I'm practicing English for few years but yet I've more doubts. I would like to know which of these correct and situational meanings about "What can I do for you?" & "What I can do for you" .. Please tell me which is correct and when to use it, I know more people using more often the second one in India alike "What will I do?" & "What I will do?" . Please reply the correct sentences.

Same doubt !

where are you ?

where you are ?

which is correct