引导时间状语的介词in/on/at/during/till与until
1、用in的时间短语有：
① 表示一天中的某段时间：in the morning；in the afternoon；in the evening
② 表示周、月份、年份：in a week；in January；in Feb；in 1992
③ 表示季节：in summer；in spring；in autumn；in winter
in+表示时间长度的短语可以表示“在某段时间之内”，这时可以与现在时、过去时或将来时连用，一般与完成某动作有关；还可译为“……时间之后”，一般与将来时连用。根据时态判别in 表示的含义
in twenty minutes' time      20分钟之后
We will finish class in half an hour.
2、用on的时间短语有：
① 表示星期：on Monday；on Friday
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② 表示日期：on June 1st；on 23rd March（在书写日期时没有冠词，但在口语中则分别读为：on June the first；on the 23rd of March）
③ 表示星期+日期：on Monday, June 1st
④ 表示具体时间：on Wednesday evening；on fine afternoon；on that day
3、用at的时间短语有：
① 表示确切的时间：at five to twelve；at ten o'clock
② 表示用餐时间：at lunch/dinner time；at teatime
③ 表示其他时刻：at night；at noon；at midnight；at that time
4、during在……期间，后必须跟一个名词，可以指整个一段时间，有时可以用in替代
during spring怎么读
He has phoned four times during the last half hour.
I met him sometime during the week.（不能用in代替）  我是在这一周的某天遇到他的。
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during the holiday    强调假期的从头到尾
He enjoyed himself during his holiday.
in the holiday  强调这段时间其中某一点时间, 并不表示自始至终
I was caught in an accident in the holiday.
5、from…till…    指一段明确的时间：
The tourist season runs from June till October.
6、until    prep.&coin. 直到……时候，直到什么时候为止, 直到什么时候才
until主句和从句两个都用一般过去时对(最习惯的一种用法), 主句和从句任何一个用过去完成是也对
I can't enter for the sports meeting until tomorrow.
I had not understood the problem until he explained it.
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We hadn't disturbed him until he finished work.
  We didn't disturb him until he had finished work.
  We didn't disturb him until he finished work.(更习惯于这种用法)
7、from…to…
Everyday we have English class from 8:30 to 11:30

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