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二、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(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 ones life , in ones 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 Years 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 oclock this afternoon.
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