I wish I hadn't taken your advice.
I wish she could have come
I wish this car would go faster.
I wish you would stop talking
I wish they would stop arguing.
I wish I knew the answer.
I wish I were better at sports.
I wish I were taller.
I wish I was taller
I wish I was going with you
If only I hadn't lost all my money. Now I'm broke.
If only she had seen the doctor earlier. He could have saved her.
I am sorry I don’t know how to use the computer.If only I knew how to use it.
If only can be more emphatic than I wish.
If only I had more money! (= but I haven't)
If only I was going on holiday with you!
If only you were here. (= but you re not)
If only the sun would come out!
If only you could be here! (= but you're not)
If only I'd listened to you! (=but I didn't )
If only he could have explained! (=but he wasn't able to)