"after+段時(shí)間"表示過去的一段時(shí)間以后;
"after+將來點(diǎn)時(shí)間"表示將來的某一時(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僅說明什么時(shí)候開始，不說明某動(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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