你在文章里已经写出了有力的论点。每段都蕴含着不错的想法，但整体却显得断裂，像一连串独立的观点，而不是流畅的对话。解决办法？使用衔接词。
好的衔接词（又叫连接词或过渡词）能把读者从一个思路顺利引到下一个。它们展示因果、对比、补充、顺序等关系。恰当运用后，文章会更连贯、更有逻辑，也更易于阅读。
但问题在于：许多学习者随意塞入衔接词，却不懂其语法规则，结果听起来生硬甚至错误。让我们一起纠正吧。
选对合适的衔接词
并非所有衔接词都可以互换。根据你想表达的关系来挑选。
用于补充信息
Also, as well as, in addition – “in addition”更正式；“also”中性；“as well as”略显口语化。
The study focused on teenagers. In addition, it examined young adults.
用于对比
However, although, but, on the other hand, yet, whereas – 需要注意的是：“however”位置灵活，可放句首，也可在逗号后作插入语：
The plan was simple. The execution, however, was disastrous.
中间位置完全正确。别听信有人说它不对。
用于说明原因或结果
Because, since, as, therefore, consequently, thus – “because”引出原因；“therefore”引出结果。
He missed several classes because he was ill. Consequently, he fell behind.
用于排列顺序
First, first of all, then, next, finally – 适用于逐步说明或按时间叙事。
衔接词的放置位置（以及不该放的位置）
常见错误是把衔接词放在每个句子的开头，显得机械。多样化位置：
- 开头：However, the results were mixed.
- 中间（插入语）：The results, however, were mixed.
- 末尾（口语中偶见）：The results were mixed, however.
在正式论文里，中间位置往往更显成熟；在非正式写作或观点文章中，句首也可以。
另一个规则：不要在“and”或“but”后面直接加逗号。那是标点错误。写成 But the experiment failed.（而不是 But, the experiment failed.）
常见衔接词使用错误
- 过度使用 “however” – 并非每句话都需要对比。如果一段里出现三次“however”，可以把两处换成 “yet”、“nevertheless”，或改写不加连接词。
- 把 “although” 当作 “despite” 用 – “although + 从句（主语+动词）”。“despite + 名词或 -ing 形式”。
Although it rained, we went out.
Despite the rain, we went out.
- 在没有前置对立的情况下使用 “on the other hand” – 必须先出现 “on one hand”，或者上下文已明显呈现两面。否则改用 “in contrast”。
衔接词功能速查表
下面是一个视觉化总结，方便你快速回顾：
also
in addition
as well as
however
although
but
because
therefore
consequently
first
then
finally
在修改文章时把它当作速查表即可。
实战练习：改写一段
原例：
I studied hard. I did not pass the test. I was disappointed. I will try again.
改写后（加入衔接词）：
I studied hard, but I did not pass the test. As a result, I was disappointed. However, I will try again.
你能感受到区别吗？第二版把每个想法串联起来，读者无需猜测因果与对比。
最后小贴士：起步时少即是多
不要在一篇文章里塞进所有衔接词。挑选三到五个最适合你结构的连接词，正确使用并放置于不同位置。随后再逐步扩充词汇库。
过度使用会让写作显得机械；使用不足则显得零散。理想比例是每两、三句平均出现一个衔接词。
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