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英语介词不可单独使用，只能与不同的此类构成介词短语来在句子中担当一个成分。

常用的五种介词短语

1.介词+名词：at the door, into the bag

2.介词+代词: for me, of others

3.介词+动名词: in doing so, to my saying that

4.介词+连接副词/连接代词/what从句:over what he had better do

5.介词+连接副词/连接代词+不定式：on how to do this

其他类型的介词短语

6.介词+介词短语：from across the street, until after dinner

7.介词+副词：from below

8.介词+复合结构：with the light on

9.介词+不定式(but/except)：…did nothing but sleep介词 -- 连接词与词纽带

英语经常用介词来表示词与词之间的关系