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).
An electronics store assistant
您好，您想买什么？
Hello, what would you like to buy?
You
您好，我想买一个电脑。
Hello, I'd like to buy a computer.
You
这个电脑多少钱？
How much is this computer?
You
这个手机多少钱？
How much is this phone?
You
哪个电脑新，也漂亮？
Which computer is new and also nice?
You
这个太贵了。
This is too expensive.
You
好，我买这个。
Okay, I'll buy this one.
You
谢谢您，再见。
Thank you, goodbye.