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时间类介词 (年、月、季节前须用in (in 2008, in September, in spring), 遇到几号改用on (on…
时间类介词
年、月、季节前须用in
in 2008, in September, in spring
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黎明、正午、傍晚、夜里用at
at dawn, at noon, at dusk, at night
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Before，after 表时间点,
ago，later 表时间段
before 2016, after my birthday,
three years ago, two days later
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自从since，直到till，
by到…之前已经
since 1990, till yesterday.
I have finished my homework by 3 PM.
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