Capable of and able to

[Verunchik]

Test No. incompl/elem-16 "Learn it by heart", question 9

As of now we still don't know if we will be ......... to fulfil our contract.

(a) reliable
(b) able
(c) capable

Test No. incompl/elem-16 "Learn it by heart", answer 9

As of now we still don't know if we will be able to fulfil our contract.

Correct answer: (b) able

Your answer was: incorrect
As of now we still don't know if we will be capable to fulfil our contract.
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Why able?
Why not capable?

[Alan]

Hi,

The construction is 'capable OF doing something.

Alan
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English as a Second Language
You can read my ESL story Make or Do?