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4. across: (表面)跨过cross: 动词“跨过,越过”=go across

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.

8.by 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.

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