I'd like to return this.

我想退货

I'd like to return this，this one doesn't suit me.

我想退货，这个不适合我。

I'd like to return this, I found it broken when I got home.

我想退货，我回家时就发现它坏了。

A:You look good in red.

你穿红色真好看。

B:Thank you, but I'd like to return this.

谢谢，但是我想退货。

A:Why?

为什么呢?

B:Because I'd like to get one in a larger size.

因为我想买一个更大号的。