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.
I couldn't see you.

Ability: can and could 1

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Ability: can and could 2

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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]

Ability: could have 1

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Ability: could have 2

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Comments

Hi kirk,

To be precise, it's an indirect question isn't it?

Regards,
Tim

Hello Tim,

Yes, you're right! Sorry for the confusion. Reported and indirect questions follow the same word order.

All the best,
Kirk
The LearnEnglish Team

Thank you , I think , it is good to refresh our knowledge through a fun exercise.
All the best,
Elva

Hi,

You mentioned above that "We use conditionals to give advice: Dan will help you if you ask him" and that "Past tenses are more polite: Dan would help you if you asked him". But aren't these the structures of the first and second conditionals respectively? In order words, regarding the second sentence which utilises the past tense, isn't it done so as to express the second conditional (•if + past simple, ...would + infinitive), rather than for politeness?

Appreciate your advice, thanks!

Regards,
Tim

Hi Timothy555,

Second conditional forms are used to describe less likely events and one way to make a request or advice polite is to make it more tentative. Using a hypothetical form is one way to do this. In other words, the fact that it is a second conditional form and that it is a polite form are not mutually exclusive.

 

Best wishes,

Peter

The LearnEnglish Team

"you mustn't make a noise " it's says at the example above ,i'd like to know why we didn't use can't instead of mustn't and what's the difference and why at school in London they thought us that the negative form of must is can't not mustn't.
thnx

Hello racheed,

'must' can be used in different ways -- i.e., it has different meanings. When it is used (as in the sentence you ask about) to express obligation, which is prohibition in the negative, 'mustn't' is the negative form.

When 'must' is to express a conclusion or deduction, 'can't' is the negative form. For example, 'That can't be Santosh -- he's in Manchester, not here in York'. This means I see a man who seems to be Santosh, but since I know Santosh is in Manchester and I am now in York, he 'can't' be Santosh.

I hope that clears it up for you.

All the best,
Kirk
The LearnEnglish Team

Hi, I´d like to know the exact meaning of the sentence: "Cyclists should have to pass a test to get a licence before they are allowed on the road". Cannot I just say „cyclists have to pass a test? What is a difference between have to pass and should have to pass and should pass? Thanks in advance.

Hello annamaria,

Both 'should' and 'have to' can be used to talk about obligation. In general, 'have to' is stronger than 'should'. There are several resources I would recommend you take a look at to get a better idea of how to use them. First, our sister site LearnEnglish Teens has a page on this very topic. Second, you can find explanations and examples of 'should' and 'have to' in the Cambridge Dictionary.

As for the specific sentences you ask about, using 'should' means that you're talking about your opinion -- you believe that an obligatory test (which doesn't exist yet) is a good idea. 'have to' implies that this test is already obligatory. 'should have to pass' means essentially the same as 'should'.

All the best,
Kirk
The LearnEnglish Team

Hi.
This sentence above is correct?
"Would you like to come round to morrow?"
Thanks in advance.

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