expressing "ability"

For Senior Students.

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To express “Ability”.

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Do you know, what I did yesterday?

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What did you do?

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I wrote 20 pages. Could you write at a

stretch?

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Right now, I could not. I can spell twenty words in a minute, can

you?

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My dad says, after two years I will be able to play chess well.

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Don’t be too smart! Now I am able to play chess well.

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I can’t tolerate this. You could’ve behaved decently.

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See, how Bobby turns the pages as if he was able to read.

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When I am a little bit grownup, I will be able to express better.

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If I had read well, I could have passed.

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We use past form of the verb when we have a past timer in the sentence. Like yesterday, ago, last week etc.

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‘Can or be able’ express present ability. ‘Could’ or ‘was/were able to’ express past ability, and ‘will/shall be able to’ express future ability.

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‘Could’ can also be used for the present tense – but an element of doubt is there.Hence “Could you write at a stretch?” leaves a doubt.

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“Could” with the perfect infinitive indicate unfulfilled action. Hence “I could have passed” means I did not pass.

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