can
(but can also use
be
able to):
• He
can
speak Spanish.
We prefer
could
(but can also use
be
able to):
• After only six months, Suzanne
could
play the violin quite well.
specific achievement
We prefer
be able to
(but can also use can):
• He has now recovered from his injury
and
is able to
drive again.
We use
be able to
(not
could):
• Jenny
was able to
leave the hospital
only six hours after the baby was born.
However, we commonly use
can
or
could,
even when we are talking about specific occasions,
with verbs of the senses,
feel, hear, see, smell, taste,
and with verbs of 'thinking', e.g.
believe,
decide, remember, understand:
n •
She
could feel
the spray on her face as the boat raced through the water.
• •
I can't
decide where to go for my holidays.
We don't use
be able to
•
when we talk about something that
is happening as we are speaking:
• before
be + past participle:
• This furniture
can be assembled
by anyone, with just a screwdriver.
We use be
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