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英语中的连词是用来连接句子和短语的一类词汇，它们起到了很重要的作用。英语中的连词可以分为三类：并列连词、从属连词和对等连词。
并列连词
并列连词用于连接两个相同类型的短语或句子，它们之间是平等的关系。常见的并列连词有and、or、but、so等。例如：
- I like coffee and tea.
- Do you want to go to the park or the cinema?
- She is smart but lazy.
- I am tired, so I am going to bed.
从属连词
从属连词用于连接主句和从句，从属连词引导从句并且表明从句的类型。常见的从属连词有because、although、if、when等。例如：
- I can't go to the party because I have to work.
- Although it was raining, we still went for a walk.
- If you study hard, you will pass the exam.
- I will call you when I arrive.
对等连词
对等连词用于连接两个平等的短语或句子，这些短语或句子之间的关系是对等的。常见的对等连词有either...or、neither...nor、not only...but also等。例如：
- Either you come with me, or you stay here.
- Neither John nor Mary likes spicy food.
- Not only did he finish his work, but also he helped others.
以上是英语中的三种常见连词，它们在句子中都有不同的作用和用法，熟练掌握它们对于英语学习和应用都是非常重要的。
