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 clothing store clerk
你想买什么衣服？
What kind of clothes would you like to buy?
You
我想买衣服。
I'd like to buy some clothes.
You
我喜欢红的。
I like the red one.
You
这件衣服很漂亮。
This shirt is very pretty.
You
这件衣服多少钱？
How much is this shirt?
You
太大了，有小的吗？
It's too big, do you have a smaller one?
You
我买这件白的。
I'll buy this white one.
You
给你钱，谢谢。
Here's your money, thank you.