【英语语法解析大全】连接副词“therefore”：用法、场景、实例全解析
一、什么是“therefore”？
Therefore是一个连接副词（conjunctive adverb），用于表示因果关系，相当于中文的“因此”、“所以”。它连接两个独立的句子或观点，表明前者是后者的原因或逻辑结果。
例如：He didn’t study for the exam. Therefore, he failed.
二、“therefore”的语法位置与标点使用
“Therefore”在句中的位置灵活，但标点使用有严格规则：
| 位置 | 例句 | 标点规则 |
|---|---|---|
| 句首 | He was tired. Therefore, he went to bed early. | 后接逗号 |
| 句中 | She wanted to save money; therefore, she stopped eating out. | 前后用分号+逗号 |
| 句尾（较少见） | The weather was bad. We canceled the trip, therefore. | 前接逗号 |
三、常见使用场景与实例
1. 学术与正式写作
“Therefore”常用于论文、报告等正式文体中，表达严谨的逻辑推理。
The experiment results were inconsistent; therefore, the hypothesis was rejected.
2. 法律文件
在法律文书中，“therefore”用于引出结论或判决。
The defendant breached the contract; therefore, he is liable for damages.
3. 日常逻辑表达
虽然较正式，但口语中也可使用，尤见于辩论或解释中。
It’s raining heavily. Therefore, we should postpone the picnic.
四、与相似词汇的对比
| 词汇 | 用法区别 | 例句 |
|---|---|---|
| Therefore | 正式，表因果 | He was ill; therefore, he stayed home. |
| So | 口语化，更常用 | He was ill, so he stayed home. |
| Thus | 更正式，略带古风 | He was ill; thus, he remained home. |
| Hence | 强调结果，多用于逻辑推导 | He is the only candidate; hence, he will win. |
五、常见错误与注意事项
- 错误： He was tired therefore he went to bed. （缺少标点）
- 正确： He was tired; therefore, he went to bed. 或 He was tired. Therefore, he went to bed.
记住：therefore不能像连词那样直接连接两个独立分句，必须借助分号或句号。
六、拓展练习
尝试用“therefore”改写以下句子：
- It was raining. We decided to stay indoors.
- She didn’t have an umbrella. She got wet.
参考答案：
1. It was raining; therefore, we decided to stay indoors.
2. She didn’t have an umbrella. Therefore, she got wet.