高中定语从句选择题as的用法

2026-05-06 10:22:01 来源：网易用户：荆蝶祥

【高中定语从句选择题as的用法】在高中英语学习中，定语从句是一个重要的语法知识点，而“as”作为关系代词或关系副词，在定语从句中有着独特的用法。掌握“as”的正确用法，有助于提高在相关选择题中的准确率。以下是对“as”在定语从句中用法的总结与分析。

一、as 在定语从句中的基本用法

“as”在定语从句中可以作主语或宾语，通常引导的是非限制性定语从句，并且在句中常表示“正如……那样”。它强调的是对前面整个句子内容的补充说明，而不是对先行词本身的修饰。

1. as 引导非限制性定语从句

- 结构：主句 + ，as + 从句

- 含义：正如……（表明前文所述情况）

例句：

- He is late, as we all know.

- She passed the exam, as was expected.

2. as 作主语或宾语

- as 作主语：指代整个主句的内容。

- as 作宾语：指代前面提到的人或事物。

例句：

- As you can see, the problem is not easy.

- The result is what I had expected, as you might imagine.

二、as 的常见考点

在高考或高中英语选择题中，“as”的考查主要集中在以下几个方面：

考点	说明	例题
1. as 引导非限制性定语从句	表示“正如……”	He said nothing, as he had promised.
2. as 作主语/宾语	指代主句内容	As is known to all, the earth is round.
3. as 与 which 的区别	as 常用于“正如……”，which 用于“这一点”	He passed the exam, which surprised everyone.
4. as 与 that 的区别	as 有“正如”之意，that 无此意	He is the same person as he was before.

三、as 与 which / that 的区别

项目	as	which	that
引导从句类型	非限制性定语从句	非限制性定语从句	限制性定语从句
含义	正如……	一点（无特殊含义）	无特殊含义
位置	通常放在主句前或后	一般放在主句之后	通常紧跟先行词
例句	As we all know, he is a good student.	The book, which I bought yesterday, is very interesting.	The man that is standing there is my teacher.

四、常见错误与注意事项

1. 误用 as 代替 which

- 错误：The book, as I bought yesterday, is interesting.

- 正确：The book, which I bought yesterday, is interesting.

- （as 不能直接替代 which，除非有“正如”含义）

2. 忽略 as 的“正如”含义

- 错误：He is late, that we all know.

- 正确：He is late, as we all know.

3. 混淆 as 和 that

- 错误：He is the same person that he was before.

- 正确：He is the same person as he was before.

五、总结

“as”在定语从句中的使用虽然看似简单，但实际应用中容易出错。特别是在非限制性定语从句中，as 通常表示“正如……”，而 which 则更偏向于“这一点”。在做题时，要特别注意上下文和句子的逻辑关系，避免因理解偏差而选错答案。

表格总结：as 在定语从句中的用法对比

通过以上总结与对比，希望同学们能更好地掌握“as”在定语从句中的用法，并在考试中灵活运用。

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