英语语法中，连接词（conjunctions）是用来连接两个或多个语法单位的重要工具。在英语中，有许多不同的连词，其中一些可以用来连接同类并列的语法单位。以下是一些常用的连词：
- 并列连词（coordinating conjunctions）：and, but, or, so, yet, for, nor
并列连词是最常见的用来连接同类并列的语法单位的连词。它们可以用来连接并列的名词、动词、形容词、介词短语、副词短语等。例如：
- I like apples and oranges. (名词)
- She sings and dances. (动词)
- The dress is red and green. (形容词)
- He walked to the store and bought some milk. (介词短语)
- They went to the party and left early. (副词短语)
- 连接副词（correlative conjunctions）：either…or, neither…nor, both…and, not only…but also, whether…or
连接副词是一种特殊的连词，它们总是出现成对使用。它们可以用来连接同类并列的名词、动词、形容词、介词短语等。例如：
- Either you come with us or you stay at home. (名词)
- Neither the teacher nor the students were happy. (动词)
- Both the cat and the dog are cute. (名词)
- Not only is he smart but also handsome. (形容词)
- Whether it rains or not, we will go for a walk. (副词短语)
- 从属连词（subordinating conjunctions）：although, because, if, since, unless, until, when, while等
从属连词用来连接一个主句和一个从句，从句不能独立存在，必须依附于主句。它们可以用来连接同类并列的名词、动词、形容词、介词短语等。例如：
- Although it was raining, we still went for a walk. (名词)
- Because he was sick, he didn't go to work. (动词)
- If you study hard, you will pass the test. (动词)
- Since it's Friday, let's have a party. (介词短语)
- Unless you finish your homework, you can't watch TV. (动词)
以上是一些常用的连词，它们可以用来连接同类并列的语法单位，使句子更加清晰明了。在写作或口语中，正确使用连词可以让语言更加流畅自然，有助于表达更加准确的意思。
