表示時(shí)間的介詞：

　　(1)in , on，at 在……時(shí)

　　in表較長(zhǎng)時(shí)間，世紀(jì)朝代時(shí)代、年、季節(jié)、月及一般（非特指）的早、中、晚

　　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

　　on表示具體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.

　　at表示某一時(shí)刻或較短暫的時(shí)間，或泛指圣誕節(jié)，復(fù)活節(jié)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

　　在last, next, this, that, some, every 等詞之前一律不用介詞

　　如：We meet every day.

　　(2)in, after 在……之后

　　"in +段時(shí)間"表示將來(lái)的一段時(shí)間以后；

　　"after+段時(shí)間"表示過(guò)去的一段時(shí)間以后；

　　"after+將來(lái)點(diǎn)時(shí)間"表示將來(lái)的某一時(shí)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 自從……

　　from僅說(shuō)明什么時(shí)候開(kāi)始，不說(shuō)明某動(dòng)作或情況持續(xù)多久；

　　since表示某動(dòng)作或情況持續(xù)至說(shuō)話時(shí)刻，通常與完成時(shí)連用。

　　例句：He studied the piano from the age of three.

　　They have lived here since 1978.

　　(4)after, behind 在……之后

　　after主要用于表示時(shí)間；

　　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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