Successive occurrence of two actions: “V1 + 了 …… 就 + V2 ……”
In Chinese, the structure “V1 + 了 …… 就 + V2 ……” is used to indicate two actions happening in immediate sequence, equivalent to “as soon as...”, “right after...”, or “then...”.
1. Single Subject
Used when both actions are performed by the same person.
Subject + V1 + 了 + Object + 就 + V2
我下了课就吃饭
妈妈起了床就做早饭
小刚拿了伞就下来
你每天晚上吃了饭就睡觉
2. Two Subjects
If the first action is performed by one person and the second action by another, the second subject MUST be placed directly BEFORE 就.
Subject 1 + V1 + 了 …… + Subject 2 + 就 + V2 ……
你下了课我们就去书店
老师进了教室我们就对她说“生日快乐”
爸爸回来了我们就吃饭
他到了办公室我就告诉他