Difference between can and be able to
Both can and be
able to can be used to talk about ability. In some cases they are
interchangeable.
Using can
Can is used in
the present tense. It is used to talk about our ability to do things.
Examples
·
I can swim.
·
She can speak English well.
·
I can swim across that stream.
Be able to is
also possible in these cases; however, it sounds a bit more formal here.
·
I am able to knit. (Less natural than ‘I can knit.’)
·
She is able to speak English well.
To talk
about our past ability, we use could. Was/were able to is
also possible.
Study the
examples given below.
·
She could read when she was three. OR She was
able to read when she was three.
Again, in
spoken English, we are less likely to use was able to.
As you can
see in all of these sentences, we were talking about general ability. Things
that we can or we could do at any time in the
present or in the past.
To talk
about things that we managed to do on specific occasions in the past, we cannot
use could. Instead, we use was/were able to. The
verb managed, succeeded (in…ing) are also possible in this
case.
·
I was able to get some really good bargains in the sale.
(NOT I could get some really good bargains in the sale.)
·
After climbing for several hours, we managed to get to the
top of the mountain. OR After climbing for several hours, we were able
to get to the top of the mountain. (NOT … we could get to the top of
the mountain.)
Both could and be
able to can be used to say that we were not capable of doing something
on a specific occasion.
·
In spite of climbing for hours, we couldn’t get to the top
of the mountain. OR In spite of climbing for hours, we weren’t
able to get to the top of the mountain.
FUENTES: www.englishgrammar.org -- www.off2class.com -- www.fluentland.com -- www.youtube.com/engvidenglish
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