Expressing
Capabilities
Example
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Explanation
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I can swim free style well.
I can’t either speak Japanese
or Chinese.
It could run to 110 kilometers
before.
I couldn’t swim when I was
young.
I’m able to take short hand.
We will be able to have it done
for you.
I was able to swim across the
swimming pool yesterday.
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Can expresses
capability in the present or future.
The negative form of can may be written can’t,
cannot, or can not.
The past form of can is could. It is
used to express general ability in the past.
The negative form of could is couldn’t or
could not.
Be able to is
also used to express capability, but can is more usual.
Be able to is
more commonly used in combination with other auxiliaries.
Was able to is
used when someone managed to do something in one particular situation.
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