"I used to be able to do it."
What's the negative form of the abovementioned sentence? Is it natural to say - "I used to be able to not do it."?
is there any grammatical (like punctuation) error in (i)
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One answer is
I didn't use(d) to be able to do it.
It is spelled both with and without the "d", and people argue over which way is grammatical, but the pronunciation is the same for both cases.