英语复合句型的转换主要通过添加修饰成分、使用逻辑连接词或调整句子结构实现，具体方法如下：
一、添加定语或状语
在名词前添加修饰成分（如形容词、名词短语），例如：
- 原句：The boy is reading a book.
- 复合句：The boy who is reading a book is my friend.
在句首或句中添加修饰动词的成分（如介词短语、副词），例如：
- 原句：She likes reading.
- 复合句：With her favorite book in hand, she enjoys reading.
二、使用逻辑连接词
用and, but, or连接简单句，例如：
- 原句：I want to go to the park. It's sunny.
- 复合句：I want to go to the park, and it's sunny.
用although, yet, however连接，例如：
- 原句：She studied hard. She still failed the exam.
- 复合句：Although she studied hard, she still failed the exam.
三、调整句子结构
用that, what, if等引导从句，例如：
- 原句：I know he is right.
- 复合句：I know that he is right.
用because, since, as等引导原因状语从句，例如：
- 原句：She is late.
- 复合句：She is late because she forgot her keys.
四、特殊句型转换
省略句：用代词或短语替代重复成分，例如：
原句：The man who is standing there is my teacher.
复合句：The man （that is standing there） is my teacher.
注意事项：转换时需注意主谓一致、时态一致及逻辑连贯性，避免冗长或歧义。
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