Questions tagged [can-modal]

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can - be able to in the same sentence

Is it possible to use them in the same sentence? For example, I can swim, but today I am not able to, because I have hurt my leg. Many natives find the sentence not idiomatic. What do you say?
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1answer
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Can't have + V3 or Couldn't have + V3

Is there any difference between the following sentences? If Jones was at work until six, he can't have done the murder. If Jones was at work until six, he couldn't have done the murder.
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2answers
47 views

Can/will vs could/would in IF clause

I have a question about can vs could in the IF clause. If you could contact us directly, it would be helpful. If you can contact us directly, it will be helpful. Which one do you think is ...
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1answer
57 views

(Why + can) - Is it a possible structure?

If I said: It can be insecure since it has two possible ways of getting forged. Then, would it be possible to ask the question like this: Why can it be insecure? I find it unnatural and maybe ...
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2answers
118 views

Could have vs could in an example (single event vs longer time period)

I would like to know whether I get it right: The siblings lived with abusive parents. They could run away anytime if they wanted. Would this be correct if I mean this as their ability over the ...
6
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1answer
142 views

How can I convince people that Could is the past form of Can?

Here in Korea, a lot of public educations are not in a great state. People have been educated too simply that the past "Tense" of Can is Could. But they never learned or been told deeply, so they get ...
2
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1answer
133 views

Can vs. Will be able to

We use can to talk about future actions which we will be able to do because of present ability, present circumstances, present decisions etc. • She can win the race tomorrow if she tries really ...