Conjunctions (连词) 的用法和例句
连词（Conjunctions）是连接词、短语或句子的词语，它们在句子中起到桥梁的作用，帮助表达更复杂的思想。连词主要分为三类：并列连词（Coordinating Conjunctions）、从属连词（Subordinating Conjunctions）和关联连词（Correlative Conjunctions）。以下是这些连词的用法及例句：
1. 并列连词（Coordinating Conjunctions）
并列连词用于连接两个或多个地位平等的词、短语或从句。常见的并列连词有：and, but, or, nor, for, so, yet。
And：表示添加或补充信息。
- 例句：I like coffee, and I also enjoy tea.
But：表示对比或转折。
- 例句：She wanted to go out, but it was raining heavily.
Or：表示选择关系。
- 例句：Would you prefer tea or coffee?
Nor：通常与neither连用，表示否定。
- 例句：Neither he nor she knew the answer.
For：表示原因或解释。
- 例句：It’s cold outside, for winter has just begun.
So：表示结果或推论。
- 例句：He didn’t study, so he failed the exam.
Yet：表示对比或对立，常用于否定句中。
- 例句：They haven’t arrived yet, despite the early start.
2. 从属连词（Subordinating Conjunctions）
从属连词引导从句，使从句在句子中充当某种成分（如主语、宾语、状语等）。常见的从属连词有：after, although, as, because, before, if, since, that, though, until, when, while, whether等。
After：表示时间上的先后。
- 例句：After finishing his homework, John went to bed.
Although/Though：表示让步或对比。
- 例句：Although it was raining, we decided to go hiking.
As：表示时间、方式或原因。
- 例句：As soon as he heard the news, he got excited.
Because：表示原因。
- 例句：I couldn’t sleep because of the noise outside.
Before：表示在某事之前发生。
- 例句：Make sure to turn off the lights before leaving the room.
If：表示条件。
- 例句：If you study hard, you will pass the exam.
Since：表示原因或自某个时间点以来。
- 例句：Since you are not feeling well, you should stay home.
That：引导名词性从句，无具体意义。
- 例句：I know that he is honest.
Until：表示持续到某一时刻为止。
- 例句：We waited until the rain stopped.
When：表示时间。
- 例句：When I saw him, he was smiling.
While：表示同时发生的动作或对比。
- 例句：While I was studying, my sister was watching TV.
Whether：表示两种可能性中的一种。
- 例句：I don’t know whether to go or stay.
3. 关联连词（Correlative Conjunctions）
关联连词成对出现，连接两个相互依赖的句子部分。常见的关联连词对包括：both...and, either...or, neither...nor, not only...but also, whether...or等。
Both...and：表示两者都。
- 例句：Both John and Mary are excellent students.
Either...or：表示两者之一。
- 例句：You can either take the bus or walk to school.
Neither...nor：表示两者都不。
- 例句：Neither Tom nor Sarah attended the meeting.
Not only...but also：表示不仅……而且……。
- 例句：Not only did he pass the exam, but he also got a high score.
Whether...or：表示无论哪种情况。
- 例句：Whether it rains or shines, we will go on our picnic.
掌握这些连词的用法和搭配，可以帮助你构建更加复杂和丰富的句子结构，从而提高语言表达的准确性和流畅度。
