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Is 'できなく' converted from 'できない'? I've learned adj. '..い' can convert to '..く' in this case. Does verb's 'ない' form also have such transformation?

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Does verb's 'ない' form also have such transformation?

Yes. ない behaves just like an i-adjective. And the continuative form is なく just as you'd expect.

As you may already know, to say 'becomes adjective' you replace the い of an i-adjective with く and the な of a na-adjective with に, then add なる.

So できる (can do) -> できない (unable to do) -> できなくなる (become unable to do).

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    ない behaves just like an i-adjective For the most part, but be careful with the ~そう conjugation for "seemingly not". See answers on this question for details. Confusion about “Seemingly not ~”.
    – istrasci
    Commented Feb 1, 2019 at 18:58

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