Anon: Could and able are both used to say the same thing, but not together! These all mean the same thing (present time): She is mute. She can not speak.
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AnonymousPlease let me know why it is not correct.It is not correct because could not must be followed by a verb. able is an adjective, not a verb. Anyway, could includes the meaning of able to, so it's like saying the same thing twice. Leave out "able to".