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There'sabookstore(on)thefifthfloor.为什么用ON?Ifyoudon'tgotothemeetingtomorrow.(hewon'teither)为什么不用hedoesn'teither?

题目详情
There's a bookstore (on) the fifth floor.
为什么用ON?
If you don't go to the meeting tomorrow.(he won't either)
为什么不用he doesn't either?
▼优质解答
答案和解析
1.没有为什么,就是用"on".中文也说在五楼"上"啊.
2."tomorrow"点明将来时间,说明这个句子的主体时态应该是将来时态."If you don't ..."只是个表示条件的从句,用一般现在时是可以的."he won't ..."是主句,必须用将来时态.