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 friend shopping with you
你看，这件衣服漂亮吗？
Look, are these clothes pretty?
You
你喜欢哪件？
Which one do you like?
You
这件很漂亮。
This one is beautiful.
You
那件不漂亮。
That one isn't nice.
You
这件太大了。
This one is too big.
You
那件小一点。
That one is a bit smaller.
You
我喜欢这件新的。
I like this new one.
You
我要买这件。
I'll buy this one.