具体时间点前面用 at
月份,年代,季节前面用 in
具体日期前面用 on
以festival结尾的节日名称前用 in
以day结尾的节日名称前用 on
He often play computer games in the morning/ afternoon/ evening.
He often play computer games at noon/ night.
He often play computer games yesterday/ today/ tomorrow.
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