Listen to the whole passage
Listen to the whole passage once first, then practice sentence by sentence.
The first line is the other person opening the conversation; the "You" lines are suggestions for you to practice saying in this scenario (not a back-and-forth dialogue).
A shop clerk
你好！你要买什么？
Hello! What would you like to buy?
You
你好！
Hello!
You
我要买一瓶水。
I'd like to buy a bottle of water.
You
多少钱？
How much is it?
You
给你钱，这是二十块。
Here's the money, this is twenty yuan.
You
请找我钱。
Please give me my change.
You
好的，谢谢！
Okay, thank you!
You
再见！
Goodbye!