Definition: used to say that something is the reason why something else happens Level: A2
他吃得太多了，所以他觉得不舒服。
He ate too much, ___so he felt ill.
我饿了，所以我们吃点东西吧。
I'm hungry, ___so let's eat something.
外面在下雨，所以我们待在家里吧。
It's raining outside, ___so let's stay at home.
