I learned about i wish i had vII -> something i regret that i didn't do something in the past and i have now effects of that
And about i wish i had wihout vII -> I regreat that i have to do something now.
But i have some exercise about I wish + Past simple or I wish + would.
and i don't have any idea what they mean and what difference they have. Somebody could explain me, how this 4 forms differ ?