What are you doing Tuesday afternoon?为什么时间状语前没有介词?

What are you doing Tuesday afternoon?为什么时间状语前没有介词? 为什么说what are you doing Tuesday afternoon What are you doing Thursday afternoon?时间状语前怎么没有on,我看了这的人的解释, What are you doing Tuesday afternoon 这句话为什么Tuesday afternoon 1.What were you doing last Tuesday morning?为什么没有时间介词? What are you doing Tuesday afternoon?句子中的Tuseday afternoon 前 What are you doing Tuesday afternoon.为什么不加on?（书上原句） What are you going Tuesday afternoon 这句话为什么Tuesday afternoon what are you doing Friday afternoon?对么?为什么啊 what are you doing later this afternoon What are you doing Thursday afternoon?这个句子怎么没有“ON” 为什么What are you doing ,Li Yan?"you"前是“are” 而不是“is”