
Level: beginner
Possibility and impossibility
We use could to show that something is possible, but not certain:
They could come by car. (= Maybe they will come by car.)
They could be at home. (= Maybe they are at home.)
We use can to make general statements about what is possible:
It can be very cold here in winter. (= It is sometimes very cold here in winter.)
You can easily get lost in this town. (= People often get lost in this town.)
We use can't or cannot to say that something is impossible:
That can't be true.
You cannot be serious.
Level: intermediate
We use could have to make guesses about the past:
It's ten o'clock. They could have arrived by now.
Where are they? They could have got lost.
We use could to make general statements about the past:
It could be very cold there in winter. (= It was sometimes very cold there in winter.)
You could easily get lost in that town. (= People often got lost in that town.)
We use can't have or couldn't have to say that a past event was impossible:
They know the way here. They can't have got lost!
If Jones was at work until six, he couldn't have done the murder.
Ability
Level: beginner
We use can and can't 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 and can't to talk about the ability to do something at a specific time in the present or future:
I can see you.
Help! I can't breathe.
We use could and couldn't to talk about the past:
She could speak several languages.
They couldn't dance very well.
Level: intermediate
We use could have to say that someone had the ability or opportunity to do something, but did not do it:
She could have learned Swahili, but she didn't want to.
I could have danced all night. [but I didn't]
Permission
Level: beginner
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.
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 for free.
We use can't to refuse permission or say that someone does not have permission:
You can't go home yet.
Students can't travel for free.
Requests
We use could you … 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
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 could give you a lift to the station.
Suggestions
We use could to make suggestions:
We could meet at the weekend.
You could eat out tonight.
Questions and negatives
We make questions by putting the subject after can/could:
Can I ...? Could I ...? etc. |
Can you ...? Could you ...? |
The negative form is can't in spoken English and cannot in written English.
We sometimes say cannot, but it is very emphatic.
The negative form of could is couldn't in spoken English and could not in written English.
- can and could: possibility 1
- can and could: possibility 2
- can and could: other uses 1
- can and could: other uses 2
Hello Girikumar
Could you please search our site for an appropriate page to ask your questions? For example, in this same Verbs section, there is a page called 'will' and 'would'. I expect the explanation there will answer question, but if not, please feel free to ask us. We just ask that you try to ask your question on a relevant page.
All the best
Kirk
The LearnEnglish Team
Hello GIRIKUMAR,
As far as I am aware there is no difference in meaning between sure of and sure about. I don't know of any context where only one would be correct, though there are certain phrases where one is preferred, such as when using a reflexive pronoun (sure of yourself rather than about).
Peter
The LearnEnglish Team
Hello Abhinav,
In most contexts, the sentences can be used interchangeably.
Can carries the meaning of 'has the ability to', so you could imagine a situation in which you want to stop a person getting the ability to kill. For example, you might want to act so that someone is prevented from getting hold of a weapon which would make it possible for him to kill you.
Peter
The LearnEnglish Team
Hello Dayan
In the first sentence, 'can' seems to be used to give permission to someone. The second sentence seems a little odd to me (I think I'd say 'do' instead of 'can'), but I suppose it's describing an ability. In the third sentence, I'd say it's speaking about possibility.
Hope that helps!
All the best
Kirk
The LearnEnglish Team
Hello GIRIKUMAR,
While could can function as the past form of can when describing ability (I can swim vs I could swim), here you are using them for (im)possibility. In this use, they are interchangeable in many contexts. However, can't have is generally used for more recent contexts and couldn't have for ones further back in time.
You can read more about this in the discussion on this page:
https://english.stackexchange.com/questions/141589/cant-have-been-vs-couldnt-have-been
Peter
The LearnEnglish Team
Hello Aniyanmon,
The sentence does not look correct to me. You could say either of these:
He could come here yesterday is incorrect because it implies some kind of time travel: a present or future possibility (He could come here) with a past event (yesterday).
Peter
The LearnEnglish Team
Hello japezuela,
I think would not be able to... is far more likely in any context I can think of. Did you have a particular context in mind?
Peter
The LearnEnglish Team
Hi japazuela,
In that situation we would use either 'able to' or 'could', but not both together:
The only time we might use 'could' and 'able to' together is when we are using 'could' to talk about possibility rather than ability. In other words, 'could not be able to' might mean 'it is possible that [he/she] would not be able to...'
However, it is hard to think of a situation where we would use such a form, and I think other less ambiguous forms would be preferred in any case, such as 'could be unable to', 'might not be able to' or 'might lose the ability to'.
Peter
The LearnEnglish Team
Hello gullu_summi
No, I'm afraid that's not correct. 'can' is a modal auxiliary verb and so 'do' is not used in a question. The correctly formed question would be 'Can AMS lead to death?'. I'd suggest you read our Question forms page for more on this grammar.
All the best
Kirk
The LearnEnglish Team
Hello Garry301,
The correct form is 'could' because you are talking about a hypothetical situation (I could eat a horse if you gave me one) rather than a physical ability (I can eat a horse because I've got an enormous stomach).
Peter
The LearnEnglish Team
Hello Ali. Chy
No, I'm afraid that's not correct. I'm not completely sure what you want to say, but 'If she is single, I could marry her' is grammatically correct and logical.
All the best
Kirk
The LearnEnglish Team
Hello Sheena virmani
Those are all fine, but I would recommend 2 -- it's probably the most common way to phrase a request like this. Or if you want to be more formal, 1 is more appropriate.
All the best
Kirk
The LearnEnglish Team
Hello arthurlocke,
I think it's perfectly fine to use 'can' in all of those situations in terms of grammar. The reason some examples seem less convincing is, I think, rather the result of it being difficult to imagine an appropriate context rather than a grammatical issue. For example, all of these sentences are perfectly fine:
Peter
The LearnEnglish Team
Hello arthurlocke,
As I said in my earlier reply, there is no grammatical problem with using 'can' in these ways. Provided the context is appropriate, you can use 'can' with both simple and continuous infinitive forms:
The British Council does not recommend publications as we have a policy of neutrality with regard to publishers. As far as resources go, other than this section on our site, there are many grammar books available from the major publishers. The best way to choose is to visit a good bookshop and take a look at several grammar books so you can compare entries on the same topic to see their levels of detail and clarity of explanation side by side.
Peter
The LearnEnglish Team
Hello Ashmin,
I'm afraid neither answer sounds right to me. Perhaps 'She would help if she could'?
All the best,
Kirk
The LearnEnglish Team
Hello arthurlocke,
It is possible to use perfect modal verbs with a future meaning provided you have a future point in time from which you are looking back. The so-called future perfect form (will have done) is an example of this bith other modal verbs can be used in place of will, so long as the context is suitable. For example:
Peter
The LearnEnglish Team
Hello dhana,
Neither sentence is correct.
In the second sentence the last word should be, I guess, 'now' rather than 'know''. In this sentence the speaker is speculating about the present. They are guessing that the people ('they') are probably already at their destination.
The first sentence is not correct. We do not use a past form after 'could', so you cannot say 'could arrived'.
Peter
The LearnEnglish Team
Hi araisin,
If possible, you should ask your teacher, but I imagine she was thinking that the action of remembering (not forgetting) is in the present time. In other words, the things that you remember are in the past, but the action of remembering them is in the present. Does that make sense?
All the best,
Kirk
The LearnEnglish Team
Hello tjmanya,
Yes, that is possible, since the verb 'jump' can be used without the modal verb 'can' or with it. In other words, in your version, 'jumps' is not modified by 'can'. Most of the time, however, people say 'can jump the farthest' instead of 'jumps the farthest', so I'd recommend using 'can' with it.
All the best,
Kirk
The LearnEnglish Team
Hello ksjksyhmwwjh,
It's difficult to be clear without having a context to which we can refer. In general, we use 'could' when the situation we are describing is either (a) a real situation in the past (the speaker may be talking about his or her childhood, for example) or (b) a hypothetical or unreal situation in the present or future. We use 'can' when the situation is a real or likely situation in the present or future.
Best wishes,
Peter
The LearnEnglish Team
Hello
In this case I think 'could' is probably the best option. 'Can' suggests that asking for more is a real possibility, while 'could' suggests that it is purely a hypothetical situation. Perhaps a very religious person who is praying and who believes that they are speaking to their god might say 'can', for example, but generally 'could' is the more natural-sounding option.
Best wishes,
Peter
The LearnEnglish Team