(1)简单介词，如at, in off, on, by, to, with等。

(2)合成介词，如into, inside, within, throughout等。

(3)短语介词，如according to, because of, in addition to, in front of, in spite of等。

(4)二重介词，如from behind, from among, until after, at about等。

介词的宾语

(1)名词：Let's go for a walk along the river. 咱们到江边散散步。

(2)代词：He's standing in front of me. 我站在我前面。

(3)形容词：Her pronunciation is far from perfect. 她的语音远不是完美的。

(4)动名词：He's good at drawing.他善长绘画。

(5)过去分词：I took it for granted that she was for England.我还以为她是英国的。

(6)不定式：I had no choice but to lie down. 除了躺下外我别无选择。

(7)疑问词+不定式：I don't know how to improve my English.我不知道如何提高我的英语水平。

(8)副词：I didn't know it until recently. 直到最近我才知道此事。

(9)数词：He was among the first to arrive. 他是第一批到的。

(10)介词短语：She won't go home until after the exam. 她要考完试之后再回家。

(11)从句：I'm worried about where he is. 我担心他上哪儿去了。

介词短语的作用

介词和它的宾语构成介词词组，其用法如下：

(1)作定语：The girl in red is my sister. 穿红衣的那个女孩是我妹妹。

(2)作状语：Can you say it in English? 这个你会用英语说吗？

(3)作表语：He's in the office. 他在办公室。

(4)作补语：I always find her at her studies. 我经常发现她在学习。

(5)作介词宾语：I saw her from across the street. 我从街对面望见了她。