推荐回答(5个)
一、on用于具体的某一天(上、下午和晚上)前。在年份前用im,月份前
用in,年月前用in,季节前用in;在日前用on,月目前用on,年月日前用on,星期前用on,以Day结尾的节日前用om。例:
in 2008;in spring/summer/autumn/winter;in September;in September, 2008;on September 10th;on September 10th, 2003, on Monday/Tuesday;on Christmas Day; on Women' s Day,on National Day(在国庆节那天)

二、morning, afternoon, evening Hi this, that, next, last, tomorrow,yesterday等词限定时,则前面一律不用介词。例:
1、The boy was later for class this morning.
这个男孩今天早上上学迟到了。
2、Last Wednesday Lucy didn t go to school, because she was ill.
上个星期三露西没上学,因为她生病了。
3、I shall give a talk nert Thesday morning.
下周二上午我要作报告。
4、Tomorrow afernoon we are going to watch a football match.
明天下午我们将看一场足球赛。
5、There was an accident on this street that afternoon.
那天下午在这条街上发生了一起车祸。
三、在时间点前常用介词at,例:
at six o clock; at half past eight, at ten to nine; at a quarter pasteleven; at twelve twenty.
四、其他情况。例:
1、My family moved to France in that summer.
那个夏天我们家搬到了法国。( in that summer表特指)
2、How many minutes are there in an hour?一小时有多少分钟? (in an hour表泛指)
3、What day is it todav?
今天星期几今天是什么节日?
It is Tuesday/Children’sDay.
今天是星期二/儿童节。(I指 Tuesday或 Children's day故Tuesday或 Children Day前不加on)
4、My birthday is on October Ist.
10月1日是我的生日。( My birthday前不加on)
5、Let s make it nine forty.
我们把时间定在9:40吧。(it指 nineforty,故 nine forty前不加at)
6、It rained heavily last night.
昨晚雨下得很大。( last night不能写成yesterday night)
7、We’Il leave here tomorrow morning.
明早我们将离开这里。( tomorrow morning不能写成 next morning)
具体到某天某日的用介词on,不具体的某年或某月用介词in。
at,in和on都可表示时间。at通常指确切的某个时刻,如at six o'clock; in通常表示一天的某一部分,如in the morning〔evening,afternoon〕; on则具体说明哪一天的上午或下午,如on Monday morning,on a summer's day。
在谈论节日时,at通常指整个的节〔假〕日,不只指一天,如at Easter 在复活节,at Christmas 在圣诞节; on可具体指节日的某一天,如on Easter Monday 在复活节后的星期一,on Christmas Day 在圣诞节(那天)。
在谈论月份、季节、年份或世纪时,通常用介词in,如in the eighteenth century 在18世纪,in summer 在夏天,in March 在三月,in 1985 在1985年。
例如:
1、They are getting married in July.
他们七月就要结婚了。
2、They are getting married on July 7th.
他们七月七日结婚。

扩展资料:
固定短语:
1、in the morning/afternoon/evening在早晨/下午/傍晚,
2、at noon/night在中午/夜晚, (不强调范围,强调的话用during the night)
3、early in the morning=in the early morning在大清早
4、late at night在深夜
5、on the weekend在周末(英式用at the weekend在周末, at weekends每逢周末)
6、on weekdays/weekends在工作日/周末,
7、on school days/nights在上学日/上学的当天晚上
具体到某天某日的用介词on,不具体的某年或某月用介词in。例如:
1、They are getting married in July.
他们七月就要结婚了。
2、They are getting married on July 7th.
他们七月七日结婚。

扩展资料:
固定短语:
1、in the morning/afternoon/evening在早晨/下午/傍晚,
2、at noon/night在中午/夜晚, (不强调范围,强调的话用during the night)
3、early in the morning=in the early morning在大清早
4、late at night在深夜
5、on the weekend在周末(英式用at the weekend在周末, at weekends每逢周末)
6、on weekdays/weekends在工作日/周末,
7、on school days/nights在上学日/上学的当天晚上
精确到日期,用on
in on在时间上的区别
1. 表示时间的某一点、某一时刻或年龄等用 at.如:
I get up at six in the morning.
2. 泛指一般意义的上午、下午或晚上以及月或年等较长的时间,一般用 in.如:
We watch TV in the evening.
3. 若表示星期几或某一特定的日期,则用 on.如:
He left here on the fifth of May.
in后面只加月份,on后面加具体的日期。
如:
1. They are getting married in July. 他们七月就要结婚了。
2. They are getting married on July 7th. 他们七月七号结婚。
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