【介词后加什么】在英语学习中，介词的使用是一个重要但容易混淆的部分。介词后面通常接名词、代词或动名词（即动词的-ing形式），以构成介词短语，表达时间、地点、方向、原因等含义。掌握介词后应该接什么词，有助于提高语言准确性与表达能力。
一、
介词是一种不能单独使用的虚词，它必须和名词、代词或动名词一起构成介词短语。常见的介词有：at, in, on, by, with, about, for, to, from, over, under, between, among 等。
1. 介词 + 名词/代词
这是最常见的用法，表示位置、时间、对象等。例如：
- I am at school.
- She is talking to him.
2. 介词 + 动名词（-ing 形式）
有些介词后面可以接动名词，表示动作或状态。例如：
- He is interested in learning English.
- They are thinking about going to the park.
3. 介词 + 从句
有时介词后也可以接一个完整的从句，但这种情况相对较少见。例如：
- This is the reason why he left.
需要注意的是，并不是所有介词都可以接动名词，具体要根据固定搭配来判断。同时，某些介词后只能接名词，不能接动名词，如：
- He is afraid of snakes.（不能说 afraid of snake）
二、表格总结
| 介词 | 后面可接的内容 | 举例说明 |
| at | 名词、代词、动名词 | at home, at the station, at eating |
| in | 名词、代词、动名词 | in the room, in her hand, in working |
| on | 名词、代词、动名词 | on the table, on me, on working |
| by | 名词、代词、动名词 | by the window, by him, by working |
| with | 名词、代词、动名词 | with a pen, with her, with working |
| about | 名词、代词、动名词 | about the news, about him, about working |
| for | 名词、代词、动名词 | for you, for the job, for working |
| to | 名词、代词、动名词 | to the city, to him, to working |
| from | 名词、代词、动名词 | from here, from him, from working |
| over | 名词、代词、动名词 | over the house, over him, over working |
| under | 名词、代词、动名词 | under the bed, under him, under working |
| between | 名词、代词、动名词 | between us, between them, between working |
| among | 名词、代词、动名词 | among the people, among them, among working |
三、注意事项
- 有些介词后只能接名词，如：
- be good at something（不能说 be good at doing something？不，其实可以！）
- be interested in something（可以接名词或动名词）
- 一些固定搭配需要特别记忆，如：
- look forward to doing something
- depend on someone
- think about something
总之，介词后的结构虽然有一定的规律，但也有很多例外和固定搭配，建议多阅读、多练习，逐步掌握其用法。