The conjunction 完了
We use the conjunction 完了 
to indicate that the next action will start after the first action is completed.
to indicate that the next action will start after the first action is completed.Scheme
(action 1)
完了
action
Examples
你快点儿写作业，完了我们去公园玩儿
Finish your homework quickly and then we can go to the park
nǐ kuài diǎnr xiě zuòyè, wán le wǒmen qù gōngyuán wánr
完了我们再给你抽血化验
We will take another blood test after we finish
wán le wǒmen zài gěi nǐ chōu xiě huàyàn
我先吃饭吧，完了才去酒吧
I’ll first eat some food and then go to the bar
wǒ xiān chīfàn ba, wán le cái qù jiǔbā