【专四连词辨析】在英语专业四级考试（TEM-4）中，连词的使用是语法部分的重要考点之一。掌握常见连词的区别和用法，有助于提高阅读理解与写作能力。本文将对常见的专四常考连词进行辨析，并通过表格形式进行总结，帮助考生更好地理解和记忆。
一、常见连词辨析
1. and / but / or
- and 表示并列或顺承关系，用于连接两个相同性质的成分。
- 例句：I like apples and oranges.
- but 表示转折关系，强调前后对比。
- 例句：She is smart, but she is not confident.
- or 表示选择关系，通常用于疑问句或否定句中。
- 例句：Do you want tea or coffee?
2. so / therefore / thus
- so 表示结果，语气较口语化。
- 例句：It was raining, so we stayed home.
- therefore 表示逻辑上的结论，语气正式。
- 例句：He studied hard; therefore, he passed the exam.
- thus 同样表示结果，常用于书面语。
- 例句：The plan failed; thus, they had to start over.
3. because / since / as
- because 强调原因，回答“why”问题。
- 例句：I stayed home because I was tired.
- since 和 as 都表示原因，但语气较弱，常用于陈述事实。
- 例句：Since it was late, we left early. / As it was raining, we stayed inside.
4. although / though / even though
- although 和 though 均表示让步，可互换使用。
- 例句：Although it rained, we went out.
- even though 强调让步程度更强。
- 例句：Even though he was tired, he continued working.
5. if / whether
- if 表示条件，也可引导宾语从句。
- 例句：If it rains, we will cancel the trip.
- whether 多用于正式场合，尤其在介词后或与“or not”连用时。
- 例句：I don’t know whether he will come.
6. while / when / as
- while 表示“当……的时候”，强调两个动作同时发生。
- 例句：While I was cooking, she was watching TV.
- when 表示“当……的时候”，可用于过去时间点或事件。
- 例句：When I arrived, the meeting had already started.
- as 表示“随着……”，强调时间变化过程。
- 例句：As the sun set, the sky turned red.
二、连词使用要点总结
| 连词 | 功能 | 用法特点 | 例句 |
| and | 并列 | 连接相似成分 | She likes reading and writing. |
| but | 转折 | 表示对比 | He is rich, but he is unhappy. |
| or | 选择 | 用于疑问句或否定句 | Do you want tea or coffee? |
| so | 结果 | 口语化 | It was cold, so I wore a coat. |
| therefore | 结果 | 正式书面语 | He worked hard; therefore, he passed. |
| thus | 结果 | 书面语，强调因果关系 | The plan failed; thus, we changed it. |
| because | 原因 | 回答“why” | I stayed home because I was sick. |
| since | 原因 | 语气较弱，多用于陈述 | Since it was late, we left early. |
| as | 原因 | 语气较弱，常用于解释 | As it was raining, we stayed inside. |
| although | 让步 | 与though可互换 | Although it was difficult, she tried. |
| though | 让步 | 与although可互换 | She passed the exam, though she was nervous. |
| even though | 让步 | 强调让步程度 | Even though it was raining, we went out. |
| if | 条件 | 表示假设 | If you study, you will pass. |
| whether | 是否 | 多用于正式场合 | I don’t know whether he will come. |
| while | 时间 | 强调同时发生 | While I was sleeping, the phone rang. |
| when | 时间 | 表示具体时间点或事件 | When I saw her, I felt happy. |
| as | 时间 | 强调过程 | As the day went on, the weather improved. |
三、备考建议
在备考专四时，建议考生：
- 多做真题练习，熟悉常见连词的使用场景；
- 注意区分近义连词之间的细微差别；
- 在写作中尝试使用不同连词，增强语言表达的多样性；
- 结合语境判断连词的正确用法，避免机械记忆。
通过系统学习和反复练习，考生可以有效提升连词运用能力，为专四考试打下坚实基础。
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