●on（具体到某一天），周日或特定某日中的一段时间或怎么样的一天，早中晚：
on July2 7月2号 on Sunday 星期日
on the morning of last Sunday 上星期天早晨
●in （不具体到某一天）一日中的早晨、下午、晚上、周、季节、年、世纪：
in the afternoon 在下午 in a week(summer,year)一周（在夏季，一年）
●at (侧重在点) 点钟，一日中的黎明，中午，黄昏，半夜：
at six(dawn) 6点钟（在黎明） at noon at midnight
★ on Sundays=every Sunday 每星期日
on week days = from Monday to Friday 从星期一到星期五的周日
★ 当某月某日上，下午或晚上之前有early, late, 等修饰词时，不用on而用in 如：early in the moning of May 4th 或in the early morning of May 4th 五月四日凌晨
★ 如果时间词前有面有next,this,last,every等词语修饰时，常不用介词
如：last Sunday
☆at还有在......期间的意思at Christmas 在圣诞期间 on Christmas Eve圣诞前夕
来些习题试试哈~~
( ) 1 Children get gifts ____ Christmas and ____ their birthdays.
A. on; on B. at; on C. in; in D. in; on
( ) 2 -There is nothing ____tomorrow afternoon, is there?
-No. We can have a game of table tennis.
A. on B. in C. out D. up
( ) 3 A lot of students in our school were born____March, 1981.
A. in B. at C. on D. since
( ) 4 Tim suddenly returned____ a rainy night. A. on B. at C. in D. during
( ) 5 My grandfather was born____Oct. 10, 1935.
A. on B. in C. at D. of
( ) 6 The train is starting___five minutes.
A. in B. at C. for D.still
( ) 7 Mike does his exercises ____ seven _____ the evening.
A. on; to B. at; in C. by; of D. at; on
( )8 Why did you get up so early ___ this morning.
A. on B. / C. at D. in
( ) 9 Ann moved___Hangzhou___September, 1992.
A. /; in I B. to; in C. to; on D, in; in
( )10 He arrived ___ Shanghai ___ 9: 30 ___ March 5. f
A. at; in; at B. to; on; at C. in; on; at D. in; at; on
( )11 The English teacher told me to get there____ half past ten.
A: in B. at C. on D. of
答案是BAAAA ABBBD B有不明白的可以问哈~~
There is nothing on tomorrow afternoon .
老师，这个 on , 是 be on 短语 , 还是 on 要加在 tomorrow afternoon 前? 有人说 tomorrow 前是不要介词的。
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