Think of a time when your friend wanted to buy something, but you didn't like it. What did you say to him/her?
Listen to this conversation:
Louise: Here is the dress I love. What do you think? Does it look ok on me?
Zoe: Well I'm not sure.
Louise: Why what's wrong with it?
Zoe: I don't think it suits you. It's a bit short. Why don't you try this black one?
Louise: But what's wrong with this one?
Zoe: If I were you I'd try the black one. I think it looks great.