英语中的关联词在句子中起着连接两个或多个句子成为一个完整的意思的作用。常用的关联词包括连词、副词和代词。

1. 连词

连词是英语中最常用的关联词之一，可以连接两个或多个句子，或者是连接两个或多个词组。连词主要有三种类型：并列连词、从属连词和对比连词。

1.1 并列连词

并列连词用于连接两个或多个并列的句子或词组，常见的并列连词包括and，or，but，so等。例如：

- I like to read books and watch movies.

- You can choose to come or stay at home.

- I want to go out but it's raining outside.

- She is happy, so she sings a song.

1.2 从属连词

从属连词用于连接主句和从句，从属连词可以分为三种类型：时间从属连词，条件从属连词和原因从属连词。常见的从属连词包括when，if，because，although等。例如：

- When I was a child, I liked to play with toys.

- If it rains tomorrow, we will stay at home.

- Because I have a headache, I cannot go to work.

- Although it's cold outside, I still want to go for a walk.

1.3 对比连词

对比连词用于连接两个相互对比的句子或词组，常见的对比连词包括but，however，while等。例如：

- He is rich, but he is not happy.

- I like to watch TV, however, my sister prefers to read books.

- While I was working, my friend was playing games.

2. 副词

副词通常用于连接两个或多个句子，表示时间、地点、方式、原因等关系。常见的副词包括therefore，however，moreover，nevertheless等。例如：

- I am tired, therefore, I will take a nap.

- He is a great player, however, he still needs to improve his skills.

- Moreover, it's important to have a healthy diet.

- Nevertheless, he still decided to go to the party.

3. 代词

代词通常用于代替名词，但在一些情况下，代词也可以作为关联词使用。常见的代词包括that，which，who，whom等。例如：

- The book that I read yesterday was interesting.

- The movie which we watched last night was boring.

- He is the person who helped me with my homework.

- The girl whom I met yesterday is my friend.