Composing music is beyond his ability.
Physical ability is just part of becoming a trained athlete.
He lacks the ability to come up with his own answer.
She has the ability to play the piano.
"Fastly" is not a word. The appropriate word to use in place would be quickly."She is doing it quickly" or "She is doing it fast" are both acceptable.
The word commonly used to describe the ability to control the actions of others is "manipulation."
I have absolutely no idea what i am doing.
They were consciously aware of what they were doing.
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Authority
The ability to use the word 'an' in the proper situation.
No, the word ability is not a compound word.
you are being pushed into doing something.
I was given allowance for doing my chores.
capable of doing something
The apple is digestable