We use We use I wish I wish and and If only with If only with the the Past simple Past simple tense to express tense to express a a regret about the present regret about the present (you feel sorry about something now):(you feel sorry about something now):

•II wish wish I could could play the saxophone. I love its sound.•If If onlyonly you you drovedrove me to scool today. It´s raining very hard.me to scool today. It´s raining very hard.

We use We use I wishI wish and and If onlyIf only withwith the the Past perfectPast perfect tense to tense to express a express a regret about the past regret about the past (you feel sorry about something (you feel sorry about something you did):you did):

•MaryMary wishes wishes she hadn´t spent hadn´t spent so much money. Now she´s broke•If If onlyonly we we had saved had saved our pocket money. Now we could have our pocket money. Now we could have a great party.a great party.

I WISH / IF ONLYI WISH / IF ONLY