Question

he used the best construction materials. (add questions tag)
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Answer 1

Explanation:

Expanded Form

Contracted Form

do not

don't

does not

doesn't

did not

is/am/are +not

didn't

isn't

amn't → ain't

aren't

has/have +not

hasn't+haven't

was/were+not

wasn't/weren't

had+not

hadn't

AVE