在英语语法中，句子可以分为简单句、并列句和复合句。本文将重点介绍并列句和复合句的英文表达方式。
并列句
并列句是由两个或多个独立的句子组成的，这些句子之间用逗号、分号或连词连接。常见的并列连词有and、or、but、so等。
例如：
- I like to swim, and my brother likes to surf.
- You can have pizza or pasta for dinner.
- She is smart, but sometimes she is lazy.
- He is tired, so he went to bed early.
复合句
复合句由一个主句和一个或多个从句组成。从句可以是名词从句、形容词从句或副词从句。从句通常由关系代词或连接词引导。
例如：
- I know that you are busy. (名词从句)
- The book, which was written by JK Rowling, is very popular. (形容词从句)
- He left when he finished his work. (副词从句)
需要注意的是，在复合句中，从句的位置和标点符号的使用非常重要。如果从句在主句之前，两个句子之间需要用逗号隔开，但如果从句在主句之后，则不需要逗号。
例如：
- Although it was raining, we still went for a walk. (从句在主句之前，需要逗号)
- We still went for a walk although it was raining. (从句在主句之后，不需要逗号)
掌握并列句和复合句的使用方法，对于提高英语写作和口语水平非常有帮助。希望本文能对大家有所帮助。
