于是... and 便... for “So … Then …”
Use 于是 and 便 to tell what happened next because of what came before.
Pattern
Event 1，于是 + event 2 ｜ Subject + 便 + verb
于是 links a situation to the action it led to; 便 is a written “就” placed right before the verb.
外面下起了大雨，于是我们决定在家看电影。
When to use 于是... and 便... for “So … Then …”
于是 starts the second clause. The first clause describes a situation, and 于是 introduces what someone did next because of it. It is mostly used to tell about things that have already happened.
我看他一个人坐在那儿，于是走过去跟他聊天。
I saw him sitting there alone, so I went over and chatted with him.
他发现手机不见了，于是马上回教室去找。
He noticed his phone was missing, so he went straight back to the classroom to look for it.
他吃完早饭便出门了。
He left the house as soon as he finished breakfast.
我们到了以后，便开始准备晚会。
After we arrived, we started getting the party ready.
Common traps
- Put 便 after the subject: 他便走了, not 便他走了.
- Don’t pair 于是 with 因为; use 因为……所以…… for cause and result.
- For future plans in order, use 先……然后……, not 于是.
Targeted drill
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