介词in/at/on在时间名词前的用法口诀:年月周前要用in,日子前面却不行。遇到几号要用on,上午下午又是in。要说某日上下午,用on换in才能行。午夜黄昏须用at,黎明用它也能行。at可用在时分前,说“差”可要用上to,说“过”只用past。多说多练牢牢记,莫让岁月空蹉陀。
in 1990 / in May / in a week
on May Day / on the fifth of July
in the morning / in the afternoon
in the evening
at noon / at night / at dawn