in表示较长时间,如世纪、朝代、时代、年、季节、月及一般(非特指)的早、中、晚等。

     如:in the 20th century, in the 1950s, in 1989, in summer, in January,        in the morning, in the night, in one’s life , in one’s thirties等。

     on表示具体某一天及某一天的早、中、晚。

     如:on May 1st, on Monday, on New Year’s Day, on a cold night        in January, on a fine morning, on Sunday afternoon等。

     at表示某一时刻或较短暂的时间,或泛指圣诞节,复活节等。

     如: at 3:20, at this time of year, at the beginning of, at the end of …,        at the age of …, at Christmas, at night, at noon, at this moment等。

     注意:在last, next, this, that, some, every 等词之前一律不用介词。如:We meet every day.     (2)in, after 在……之后

    “in +段时间”表示将来的一段时间以后;

    “after+段时间”表示过去的一段时间以后;

    “after+将来点时间”表示将来的某一时刻以后。

    例句:My mother will come back in three or four days.        He arrived after five months.        She will appear after five o’clock this afternoon.

    (3)from, since 自从……

     from仅说明什么时候开始,不说明某动作或情况持续多久;

     since表示某动作或情况持续至说话时刻,通常与完成时连用。

     例句:He studied the piano from the age of three.         They have lived here since 1978.

    (4)after, behind 在……之后

     after主要用于表示时间;      behind主要用于表示位置。

     例句:We shall leave after lunch.         Lucy is hiding behind an old house.

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