于是 vs 然后 (yúshì vs ránhòu): consequence vs sequence
The key difference between 于是 (yúshì) and 然后 (ránhòu) is that 然后 marks simple temporal sequence ('then, after that'), while 于是 conveys that the second event is a logical consequence or natural result of the first ('thereupon, consequently'). 然后 is purely chronological; 于是 implies causation or a natural progression.
Both 于是 (yúshì) and 然后 (ránhòu) are used to connect two clauses in chronological order, but they differ in nuance. 然后 is a neutral temporal connector meaning 'then, after that' — it simply indicates the next step in time, without any implication of causality. 于是, on the other hand, adds a sense of consequence or logical result: it suggests that the second event occurs because of the first, often translating as 'thereupon', 'consequently', or 'so'. While 然后 is common in both formal and informal speech, 于是 is somewhat more formal and typical of written narratives or structured explanations. Choosing the wrong one can obscure whether you intend a simple sequence or a cause-effect relationship.
When to use each
Use 于是 when the second event is a direct result, logical consequence, or natural outcome of the first. It often appears in narratives to show causation or a chain of events where one situation leads to another. It is also appropriate in formal or written contexts where causality needs emphasis.
于是 can sound slightly formal or literary; it is less common in casual conversation than 然后. It usually connects two complete clauses and cannot be repeated in a series like 然后.
Use 然后 for simple temporal succession — to say 'after that' or 'then' without implying any cause-effect relationship. It works in all registers, from everyday speech to formal writing, and is especially common when listing steps in a process or telling a series of events in order.
然后 can be repeated multiple times in a sequence (e.g., 然后…然后…) to indicate a series of steps, which is not possible with 于是. It is also often used with other connectors like 先…然后… ('first…then…').
At a glance
| 于是 | 然后 | |
|---|---|---|
| Core meaning | Consequence / result | Temporal sequence |
| Causality | Always implies a causal or logical link | No causal implication |
| Register | Slightly formal, common in writing | Neutral, common in speech and writing |
| Usage in a series | Rarely repeated; one-time connective | Can be repeated (然后…然后…) |
Examples
- 于是他听到这个消息，于是马上赶了过来。Tā tīngdào zhège xiāoxi, yúshì mǎshàng gǎn le guòlái.He heard the news, and thereupon rushed over immediately.The second action (rushing over) is a direct consequence of hearing the news.
- 然后我先去超市买点东西，然后回家做饭。Wǒ xiān qù chāoshì mǎi diǎn dōngxi, ránhòu huí jiā zuòfàn.I first go to the supermarket to buy some things, then go home and cook.Simple temporal order: no cause-effect between going to the supermarket and cooking.
- 于是雨停了，于是他们决定继续爬山。Yǔ tíng le, yúshì tāmen juédìng jìxù páshān.The rain stopped, so they decided to continue climbing.The decision is a logical result of the rain stopping.
- 然后吃完饭后，然后我们去散步了。Chī wán fàn hòu, ránhòu wǒmen qù sànbù le.After finishing dinner, then we went for a walk.Just a sequence; no implication that eating caused the walk.
- 于是他努力学习，于是通过了考试。Tā nǔlì xuéxí, yúshì tōngguò le kǎoshì.He studied hard, consequently he passed the exam.Passing is a direct result of hard work.
- 然后你先做饭，然后我再洗碗。Nǐ xiān zuòfàn, ránhòu wǒ zài xǐwǎn.You cook first, then I will wash the dishes.Simple temporal order between two actions.
Common mistakes
- Using 然后 when a causal link is clearly intended, making the relationship vague (e.g., 'He studied hard, then passed' should be 于是 to show result).
- Using 于是 for simple chronological steps in a recipe or instruction manual, where no consequence is meant (e.g., 'Peel the apple, then cut it' should be 然后).
- Repeating 于是 in a series like '于是…于是…' when listing multiple steps; use 然后 instead.
- Overusing 于是 in casual speech, which can sound unnatural or overly formal; prefer 然后 unless causality is important.
FAQ
- When do I use 于是 vs 然后?
- Use 然后 for simple 'then' in a time sequence, like steps in a process or events that happen one after another without cause-effect. Use 于是 when the second event is a direct result or natural consequence of the first, especially in narratives or explanations.
- Can 于是 and 然后 be used interchangeably?
- No. In many sentences only one is correct. If you mean 'then' without causation, use 然后. If you mean 'consequently' or 'thereupon', use 于是. Overlap occurs only when the temporal sequence also implies a weak result, but even then the nuance differs.
- Is 于是 always causal?
- Yes, 于是 always carries a sense of consequence or logical progression. It is not a neutral 'then'. If there is no causal link, 然后 is the correct choice.
- Can I use 然后 to express a consequence?
- Technically 然后 can be used in a consequence context, but it will sound like you are just listing events. For a clear cause-effect relation, 于是 is more precise. Using 然后 may confuse the listener about whether the second event was because of the first.