主要介词区别
1.表示时间的at,in,on:
at表示片刻的时间,如:at 8 a.m. 常用词组有:at dawn, at noon,at night,at midnight,at the end of,at that time,
at Christmas,at New Year等。
in表示一段的时间,如:in the morning/afternoon/evening,in October,in 1998,in the 21st century, in summer, in the past, in the future等。
on指特定的日子,时间:on Monday,on Christmas Eve, on May Day,on a warm morning, on September 12, on that day等。
2.表示时间的since和from:
since “自从…以来”,常与现在完成时、现在完成进行时连用。
from “自…起”,一般多与现在时、过去时、将来时连用。如:I hope to do morning exercises from today./We have not seen each other since 1995.
3.表示时间的in和after:
in+时间段,一般用于将来时。如:We' II be back in three days.
after+时间段,一般用于过去时。如: After two months he returned.
注意:after+时间点,可用于过去时和将来时。如:After seven the rain began to fall. / What shall we do after
graduation?
4.表示方位的in,on,to:
in表示 “在…内”, Beijing is in the north of China.
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