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When I was young, I ___________ play the guitar: it was too difficult for me!
could
couldn't
COULD and COULDN'T refers to ability or inability in the past.
Her grandmother was bilingual: she_________ speak both English and Spanish.
COULD and COULDN'T are the past tense forms of CAN and CAN'T
Yesterday, Peter __________ do that exercise alone. So, he called me for help.
We use COULDN'T to mean that we weren't able to do something in the present.
Mary's grandfather _______ play chess and he was the best!