Are you free on that day为什么要加on?day前面有其他词不是不用加介词了吗?

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Are you free on that day为什么要加on?day前面有其他词不是不用加介词了吗?
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Are you free on that day为什么要加on?day前面有其他词不是不用加介词了吗?
Are you free on that day为什么要加on?
day前面有其他词不是不用加介词了吗?

Are you free on that day为什么要加on?day前面有其他词不是不用加介词了吗?
具体某一天前要用on
星期前用on
on指时间表示:
(1)具体的时日和一个特定的时间,如某日、某节日、星期几等.如:
On Christmas Day(On May 4th),there will be a celebration.
(2)在某个特定的早晨、下午或晚上.如:
He arrived at 10 o’clock on the night of the 5th.
(3)准时,按时.如:
If the train should be on time,I should reach home before dark.
4.by指时间表示:
(1)不迟于,在(某时)前.如:
He will come by six o’clock.
Jack had made some friends by the time you came.
(2)在……间,在……的时候.如:
He worked by day and slept by night.
5.through指时间意为“从……开始到结束”,此时与throughout相同.如:
We work hard all through the year.

that day 翻译是那一天,算一个词组,还是要用介词on

on that day 表示在那一天
这对话里明显两个人都知道是哪一天
在表示确指的日子就要用on
如:on this/that day, on Friday, on April 1st