The conjunction 于是
于是 indicates that two actions happened one after another.
The conjunction 于是 
is used in compound sentences. It is placed at the beginning of the second part of a sentence and connects two actions that come one after another. The second action is the result of the first action.
于是 is commonly used in spoken language.
is used in compound sentences. It is placed at the beginning of the second part of a sentence and connects two actions that come one after another. The second action is the result of the first action.
于是 is commonly used in spoken language. Pay attention
于是 is only used in the past tense. Therefore, the modal particle 了 must be placed at the end of a sentence.
must be placed at the end of a sentence.Examples
我看大家都报名了，于是我也报名了
I saw that everyone had signed up, so I signed up too
wǒ kàn dàjiā dōu bàomíng le, yúshì wǒ yě bàomíng le
The adverb 就 is often used after 于是 to emphasize the how fast the events happened.
is often used after 于是 to emphasize the how fast the events happened. Pay attention
就 is placed before a predicate.
Examples
活动太无聊了，于是我们就走了
We were bored with the event, so we left
huódòng tài wúliáo le, yúshì wǒmen jiù zǒu le
他失业了，于是就开始了找新的一份
He lost his job and started looking for a new one
tā shīyè le, yúshì jiù kāishǐ le zhǎo xīn de yí fèn
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