Read each situation carefully. Each one describes something that happened in the past that you now regret. Use "wish" + past perfect to express your regret
Your boyfriend / girlfriend asked you to marry him/her but you said no. Now you regret it!
You painted the living room green. It's a horrible colour!
You didn't work very hard at school. You failed your exams.
You quarrelled with your best friend. You want to be friends again.
You scraped the side of the car. There's a big scratch there now.