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 vendor at the market
你好，你想买什么？
Hello, what would you like to buy?
You
你好，我想买水果。
Hello, I'd like to buy fruit.
You
苹果多少钱？
How much are the apples?
You
有点贵，便宜一点，好吗？
A bit expensive, can you make it cheaper?
You
我要三个苹果。
I'll take three apples.
You
这个菜也很好，我要一点。
This vegetable is nice too, I'll take some.
You
给你钱。
Here's the money.
You
谢谢，再见。
Thank you, goodbye.