htm ][/url]. ' Be able to ' is a synonym of 'can' and 'could'. It is not used with them but instead of them, especially for the future, which cannot be expressed by can/could .
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Start by reading about 'can' and 'could' HERE and [url=http://grammar.ccc.commnet.edu/grammar/auxiliary.htm][/url].
'Be able to' is a synonym of 'can' and 'could'. It is not used with them but instead of them, especially for the future, which cannot be expressed by can