Usage note
于是表示前后动作的结果或连接。
yú shì biǎo shì qián hòu dòng zuò de jié guǒ huò lián jiē。
于是 means therefore or as a result, connecting actions.
Context note
于是常用于叙述事情经过。
yú shì cháng yòng yú xù shù shì qíng jīng guò。
于是 is often used when narrating events.
5 examples
他起晚了，于是迟到了。
tā qǐ wǎn le， yú shì chí dào le。
He got up late, so he was late.
我很累，于是回家了。
wǒ hěn lèi， yú shì huí jiā le。
I was tired, so I went home.
天气很好，于是我们去公园。
tiān qì hěn hǎo， yú shì wǒ men qù gōng yuán。
The weather was good, so we went to the park.
她听懂了，于是点了点头。
tā tīng dǒng le， yú shì diǎn le diǎn tóu。
She understood, so she nodded.
于是大家都笑了。
yú shì dà jiā dōu xiào le。
So everyone laughed.
5 mini stories
他找不到钥匙，于是打电话求助。
tā zhǎo bú dào yào shi， yú shì dǎ diàn huà qiú zhù。
He could not find the key, so he called for help.
我想再练习一次，于是又读了一遍。
wǒ xiǎng zài liàn xí yí cì， yú shì yòu dú le yí biàn。
I wanted to practice once more, so I read it again.
老师说明白了，大家于是安静下来。
lǎo shī shuō míng bái le， dà jiā yú shì ān jìng xià lái。
The teacher explained clearly, so everyone became quiet.
外面下雨了，于是我们留在室内。
wài miàn xià yǔ le， yú shì wǒ men liú zài shì nèi。
It rained outside, so we stayed indoors.
她认真准备，于是表现很好。
tā rèn zhēn zhǔn bèi， yú shì biǎo xiàn hěn hǎo。
She prepared seriously, so she performed well.
Mini dialogue
下雨了
A
外面下雨了，我们没带伞。
Wàimiàn xià yǔ le, wǒmen méi dài sǎn.
It's raining outside, and we didn't bring an umbrella.
B
于是，我们只好在教室里等雨停。
Yúshì, wǒmen zhǐhǎo zài jiàoshì lǐ děng yǔ tíng.
Therefore, we had to wait in the classroom for the rain to stop.
找铅笔
A
我的铅笔不见了。
Wǒ de qiānbǐ bùjiàn le.
My pencil is missing.
B
于是，我借给你一支吧。
Yúshì, wǒ jiè gěi nǐ yī zhī ba.
So, let me lend you one.
Related words and contrasts
similar
所以
suǒ yǐ
so; therefore
Commonly used to show a result.
similar
因此
yīn cǐ
thus; consequently
A more formal way to say 'therefore'.