介词在句中不能单独存在, 而是必须以介词短语的形式存在.。介词短语的构成如下 （其中 “介词 + 名词” 短语结构最常见）：

1) 介词 + 名词Unfortunately, there wasn't enough demand for our product. 不幸的是，我们的产品市场需求不大。There is a real need for discipline in this class. 这个班级，没纪律不行。

2) 介词 + 代词He always carried the photo with him．他总是随身带着那张相片。He is not interested in that at all. 他根本对那个不感兴趣。

3) 介词 + 动名词He entered the room without taking off his shoes．他没有脱掉鞋就进了房间。He objected to being treated like a child. 他反对被当作小孩看待。

4) 介词 + 数词She is a mother of two. 她是一位有两个儿子的母亲。It is half past six. 现在是6点半。

5) 介词 + 形容词或副词Your plan is far from perfect．你的计划远没有那么完美。I heard someone calling me from below. 我听见有人在下面叫我。

6) 介词 + 另一个介词 + 名词I saw her from across the street. 我从街对面看到她。We never play bridge until after dinner. 我们只在晚饭后打桥牌。

7) 介词 + 名词性从句The exercise are well done expect that some words are misspelled. 除了有些拼写错误之外，这些练习做得不错。The car stopped only a few inches from where I stood. 汽车在离我站的地方仅几英寸处停下来 了。He gave a lesson on how to improve soil. 他讲了一课如何改进土壤。

8) 介词 + 复合结构I had no objection to Jenny marrying him. 我不反对詹妮和他结婚。He sat in his room with no light on. 他坐在他的房间里， 没有开灯。He fell asleep with the lamp burning. 他亮着灯睡着了。

9) 介词 + 动词不定式I had no alternative but to walk out. 我别无他法只好走出去。She can do everything except cook. 她什么都会，就是不会做饭。

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