In daily usage, should I say, why did you not turn on the air? or why didn't you turn on the air?
mezzopiano In daily usage Why did you not turn on the air? No. ) Why didn't you turn on the air?
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mezzopianoIn daily usage
Why did you not turn on the air? No. (Too formal for daily usage.)
Why didn't you turn on the air? Yes.
CJ