摘要：表示时间的介词 1)in , on.at 在--时 in表示较长时间.如世纪.朝代.时代.年.季节.月及一般的早.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表示具体某一天及其早.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. 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. 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. We shall leave after lunch. Lucy is hiding behind an old house.

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