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am not able couldn’t am not able to cannot
Can；can Are；am Are；can Can；am
Whatever Wherever However Whenever
will can will be unable to will can’t am able
am able to can is able to be able to
can could be able to am able to
was able to could to am able to could be able to
whatever Whenever Wherever However
am able was able could can
am able; couldn’t could; was able to was quite able to; couldn’t couldn’t was able to
will attend am attending will be attending am going to attend
could couldn't am able to couldn't able to
Whatever Whenever Wherever However
shall have to; shall be able shall have to; am able would have to; were able would have to; would be able
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