can, be able to, could
Help
I'm very tired. I ______ (haven't been able to / couldn't) sleep recently.
haven't been able to
He ____ (wasn't able to / couldn't) speak until he was 3 years old.
wasn't able to / couldn't
We ____ (weren't able to / couldn't) do the English exercises. They were too difficult.
weren't able to / couldn't
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