What are you doing Tuesday afternoon?为什么时间状语前没有介词?但是为什么在What are you doing on Monday?中,时间状语Monday前又有介词?一直很困惑,

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What are you doing Tuesday afternoon?为什么时间状语前没有介词?但是为什么在What are you doing on Monday?中,时间状语Monday前又有介词?一直很困惑,

What are you doing Tuesday afternoon?为什么时间状语前没有介词?但是为什么在What are you doing on Monday?中,时间状语Monday前又有介词?一直很困惑,
What are you doing Tuesday afternoon?为什么时间状语前没有介词?
但是为什么在What are you doing on Monday?中,时间状语Monday前又有介词?一直很困惑,

What are you doing Tuesday afternoon?为什么时间状语前没有介词?但是为什么在What are you doing on Monday?中,时间状语Monday前又有介词?一直很困惑,
“What are you doing on Monday?” 是一定要介词的.
“What are you doing Tuesday afternoon?” 这里介词on可有可无,是有afternoon的缘故.
这是习惯问题,约定俗成了的.记住就好.
“what are you doing this afternoon?”类似的一句.或许你对这样的表述比较熟悉.

我认为What are you doing Tuesday afternoon?是错误的，Monday前面应该有介词。你认为呢？

On Monday 星期的前面用on一般是固定用法。Tuesday afternoon前面的on可以省略。
星期前的on在动词之后也可以省略。The spokesman said Tuesday that ......

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