he was born in还是on 14th September 1988原因二楼，那为什么i went out on this Sunday morning呢？
问题描述：
he was born in还是on 14th September 1988
原因
二楼，那为什么i went out on this Sunday morning呢？
答
具体日期前面都用ON
答
出现了具体日期或者星期数 用 on
只有年份或者只有afternoon, morning, evening,用in
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看我说的,“只有afternoon, morning, evening,用in”,是只有,
sunday morning不是有星期数了么?^^