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定语从句是英语语法中常见的一种从句，主要用于修饰名词或代词。正如其名称所示，定语从句是用来定语的。但是，有时候定语从句过长或者过于复杂，导致文章难以理解，这时候就需要对其进行简化。下面介绍三种定语从句简化的形式。
1. 省略关系词
在定语从句中，关系词通常包括who、whom、whose、which、that等。当主句和定语从句中的名词或代词在意义上有相同的指代时，可以省略关系词。例如：
- The girl who is wearing a red dress is my sister.
- The girl wearing a red dress is my sister.
2. 合并从句
有时候，一个句子中出现了两个定语从句，此时可以将它们合并成一个从句，减少文章的复杂度。例如：
- The book which I read yesterday and which I really enjoyed was written by J.K. Rowling.
- The book which I read yesterday and really enjoyed was written by J.K. Rowling.
3. 使用介词短语
介词短语可以用来代替定语从句，使文章更加简洁明了。例如：
- The car that belongs to my neighbor is parked in the driveway.
- My neighbor’s car is parked in the driveway.
总之，对于过于冗长或复杂的定语从句，我们可以通过省略关系词、合并从句或使用介词短语来简化它们，使文章更加清晰易懂。
