于是

• 拼音: yú shì
• 汉字拆解: 于 = classical preposition, at/in/on; 是 = 日 (sun) + 正 (upright), to be/this

含义

Therefore; so; as a result; thereupon. A conjunction used to introduce a consequence or the next step that follows naturally from a situation.

Unlike 所以, which emphasises logical cause and effect, 于是 focuses on the narrative sequence — the next action taken in response to a situation. It is more literary and formal than 就, and is often found in written Chinese and storytelling.

例句

1. 天气突然变冷，于是她从包里取出外套穿了上去。
2. 他忘记带钱包，于是只好向旁边的朋友借了一些钱。
3. 路上堵车太严重，于是大家决定改乘地铁前往目的地。

用法指南

语境: written, storytelling, everyday

语气: neutral

正确说法

• 他发现钱不够，于是决定改变计划。(He found he didn't have enough money, so he decided to change his plan.)
• 演出结束后，大家鼓掌欢呼，于是演员再次上台谢幕。(After the performance ended, the audience applauded and cheered, so the performers came back on stage to take a bow.)

错误说法

• 用'于是'来表达与前文无关的新信息 (Don't use 于是 to introduce completely new or unrelated information — it must follow logically or narratively from what was just said; use 另外 or 此外 for adding unrelated points)

起源与历史

An ancient connective phrase meaning 'at this' or 'thereupon'. 于 is a classical preposition (at/in), and 是 originally meant 'this/such'. Together they form a transitional phrase meaning 'at this point' or 'following this'.

文化背景

世代: All ages

社会背景: Universal