John's devasted. He didn't make it to the game and his team lost the finals.
John wishes he had made it to the game.
You would really like to be able to fly.
I wish I could fly.
Sally feels terrible. She broke her grandmother's tea set.
She wishes she hadn't broken her grandmother's tea set.
Mitch doesn't know how to play the guitar. He would like to know.
Mitch wishes he knew how to play the guitar.
I'm so sorry I forgot your anniversary.
I wish I hadn't forgotten / had remembered your anniversary.
You have to write a very tedious essay and this is killing you.
I wish I didn't have to write this tedious essay.
Jeff has an old computer. He'd like a new one.
Jeff wishes he had a new computer.
It's a pity I missed my cousin's surprise party.
I wish I hadn't missed my cousin's surprise party.