at,on,in,by在表时间时的区别?

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  • 1.at指时间表示:

    (1)时间的一点、时刻等.如:

    They came home at sunrise (at noon,at midnight,at ten o’clock,at daybreak,at dawn).

    (2)较短暂的一段时间.可指某个节日或被认为是一年中标志大事的日子.如:

    He went home at Christmas (at New Year,at the Spring Festival,at night).

    2.in指时间表示:

    (1)在某个较长的时间(如世纪、朝代、年、月、季节以及泛指的上午、下午或傍晚等)内.如:

    in 2004,in March,in spring,in the morning,in the evening,etc

    (2)在一段时间之后.一般情况下,用于将来时,谓语动词为瞬间动词,意为“在……以后”.如:

    He will arrive in two hours.

    谓语动词为延续性动词时,in意为“在……以内”.如:

    These products will be produced in a month.

    注意:after用于将来时间也指一段时间之后,但其后的时间是“一点”,而不是“一段”.如:

    He will arrive after two o’clock.

    3.on指时间表示:

    (1)具体的时日和一个特定的时间,如某日、某节日、星期几等.如:

    On Christmas Day(On May 4th),there will be a celebration.

    (2)在某个特定的早晨、下午或晚上.如:

    He arrived at 10 o’clock on the night of the 5th.

    (3)准时,按时.如:

    If the train should be on time,I should reach home before dark.

    4.by指时间表示:

    (1)不迟于,在(某时)前.如:

    He will come by six o’clock.

    Jack had made some friends by the time you came.

    (2)在……间,在……的时候.如:

    He worked by day and slept by night.

    5.through指时间意为“从……开始到结束”,此时与throughout相同.如:

    We work hard all through the year.