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1.in; on; at用在时间词前，表“在”1)at + 具体时刻
2)on + 具体某天(具体某天的上、下午等;星期词;以及上、下午词前有修饰词时)
3)in + 年、月、季节及一天中的某部分
但注意：at night= in the night. at noon at this / that time at Christmas
eg. 1.___ the morning 2.___ Monday morning
3. ___ a rainy evening 4. ___3:50
5.__ 2002 6.___ the morning of April 10
7.__ spring 8.___ night
9. ___ this time 10. ___ March
另外注意：在时间词(morning, afternoon, evening, Sunday...)前有last, next, this, that时，不再用介词. tomorrow, tonight前也不用介词。
eg. I will go to the cinema in this evening
2. in , on , at 表地点：
at一般指小地方;
in一般指大地方或某个范围之内;
on往往表示“在某个物体的表面”。
eg. 1) He arrived ___Shanghai yesterday.
2) They arrived ___a small village before dark.
3) There is a big hole ____ the wall.
4) The teacher put up a picture ____ the wall.
3.in , on , to表方位
in(范围内);on(范围外且接壤);to (范围外但不接壤)。可表示为下图的位置关系
eg.1) Taiwan is in the southeast of China.
2) Hubei is on the north of Hunan.
3)Japan is to the east of China.
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