(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.
(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.
三、表运动方向的介词:
across, through 通过,穿过
across表示横过,即从物体表面通过,与on有关;
through穿过,即从物体内部穿过,与in有关。
例句:She swam across the river.
He walked through the forest.
四、表示在之间的介词:
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