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四年级下册 语法专题：时间表达
（时间介词 in, on, at 规则总结）
一、时间介词(at, in ,on) 的用法：
时间介词 at 的用法：
具体的时间点或某一时刻等。如：
at ten o’clock, at half past six, at noon, at night, at midnight, at dawn
后面接表示岁数的词，如：at 6 (years old)
较短暂的一段时间，可指某个节日或被认为是一年中标志性的大事的日子。如：at Christmas, at New Year, at the Spring Festival
时间介词 in 的用法：
在某个较长的时间（如世纪、朝代、年、月、季节以及泛指的上午、下午或傍晚等）内。如：
in+时间段：in the morning/ afternoon/ evening in+ 季 节 ：in spring/ summer/ autumn/ winter in+月份：in April , in September
in+年份：in 2004, in 2018
在一段时间之后，常用于将来时。如：He will be back in two hours.
时间介词 on 的用法：
具体的时日和一个特定的时间，如某日、某节日、星期几等。如：
on a sunny day, on the night of March 5th，on my birthday, on Christmas Day, on Sunday, on Monday morning, On May 4th
准时，按时。如：on time
二、时间介词记法口诀：
at 用在时刻前，亦与正午、午夜连，
黎明、终止和开端，at 与之紧接着相伴。周月季年长时间，in 须放在其前面，
泛指一晌和傍晚，也要放在 in 后边。
on 指特定某一天，日期、星期和节日前， 某天上下和夜晚，依然要在 on 后站。
今明昨天前后天，上下这那每之前，
at、in、on 都不用，此乃习惯记心间。
三、练一练：
用介词 in on at 填空：
1999
9:45
the evening
Monday evening
June
noon
Children’s Day
8 o’clock
summer
May
单项选择：
night
May15th, 2008
( ）1. Children get gifts Christmas and their birthdays.
A. on; on B. at; on C. in; in D. in; on
( ）2. He came back a rainy night.
A. on B. at C. in D. with ( ）3. He was born October.
A. on B. in C. at D. of
( ）4. The train is arriving five minutes.
A. in B. at C. for D. on
( ）5. Mike does his homework seven the evening.
A. on; to B. at; in C. by; of D. at; on
( ）6. a cold winter morning, I met her.
A. In B. On C. At D. For
( ）7. He often goes school six thirty the morning.
A. to; at; on B. to; in; on C. to; at; in D. at; at; in
用介词 in on at 填空：
in1999
at 9:45
in the evening
on Monday evening
in June
at noon
on Children’s Day
at 8 o’clock
in summer
in May
at night
on May15th, 2008
单项选择：
1~5. BABAB
6~7. BC

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