in on at这三个介词后面接的什么?比如某年/某月/某日/上午等.

在某年/月/ 季度等用in
具体到某一天或某一天的早上/下午/晚上或一个特定的早上/下午/晚上等用on
在时刻前用at ,另外,要注意一些固定用法如at noon / night
如
He was born in 2012.
It happened on a cold winter morning .
He was born on the morning of August 12,1988.
He usually gets up at 7:00 in the morning .
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