文档介绍：; 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. the morning Monday morning
3. ___ a rainy evening 4. ___3:50  2002
the morning of April 10  spring
night   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(A) to the cinema(B) in(C) 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”。例如:
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.
, 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

)Taiwan is in the southeast of China.
  2)Hubei is on the north of Hunan.
  3)Japan is to the east of China.
    cross: 动词“跨过,越过”=go across
4.  across: (表面)跨过
through: (内部)穿过,贯穿  介词
eg. 1)Can you swim _____ the river?
   2)The road runs __________ the forest.
   3) _____ the bridge, you’ll find a cinema.
5.  in + 时间段:与将来时连用
after + 时间段:与过去时连用
但after + 时间点:可与将来时连用。
1) I’ll leave _______ three o’clock.. That is, I’ll leave ________ about ten minutes.
2)They left _______ two weeks.
6. in the tree(外加在树上的事物)
  on the tree(树上自身具有的花、果、叶等)
in the wall(镶嵌在墙内部的事物)
7. on the wall(墙表面的事物)
1) There is a map ___ the wall
2) There are four windows ___ the wall.
bike / bus / car / ship (单数且无冠词)
但当这些交通工具名词前有其它修饰词时,则应使用相应的介词。
eg. by bike = on a(the; his) bike
   by car = in a(the ; her) car
   on: 在…(表面)上——接触
9.  over: 在…的正上方
   above: 在…的斜上方  未接触
1) The moon rose ______ the hill.
2) There is a bridge _____ the river.
3) There is a book ______ the desk.
10. between: 在(两者)之间
   among :在(三者以上)之间
1)A big crowd of people were waiting for Li Lida on