This pattern is used to express regrets or wishes about the present (or future). I wish I had a car.
RULE#2
WISH (IF ONLY) + PAST CONTINUOUS
It is used to express that we want to be doing a different action in the present (or future). I wish they weren't leaving next week.
RULE#3
WISH (IF ONLY) + PAST PERFECT
We use it to show we regret something (we want something in the past to be different). We wish we had taken his advice.
RULE#4
WISH (IF ONLY) + COULD + INFINITIVE
Regret/wish in the present concerning lack of ability. She wishes she could speak French.
RULE#5
WISH (IF ONLY) + WOULD + INFINITIVE
It is used to express annoyance, impatience or dissatisfaction with a present action. I wish you would stop drinking. Wish and would must have a different subject! He wishes he would go home now.