Is his birthday on July 7th?作否定回答.

问题描述:

Is his birthday on July 7th?作否定回答.
是用No,he isn't.还是No,it isn't?如果是后者的话,

后者,英文问句中主语是his birthday,是物,故用it;
若为Was he born on July 7th?则回答No,he wasn't.