Collocations for able - adj.

be, feel, prove, seem

fully, perfectly, quite, well
He is well able to take care of himself.

better, more
Once you've had some sleep you'll feel better able to cope.

uniquely
Humans are uniquely able to use true language.

just
I was just able to make out a dark figure in the distance.

barely, hardly, scarcely
financially, physically
She is not physically able to take care of herself.

be, seem
She seems very able.

extremely, fairly, very, etc.
reasonably
less
less able students

Able is used with these nouns:
pupil