I wish I had his mobile phone number; we could tell him the good news.
PRESENT REFERENCE.
WISH + PAST PERFECT
I wish you wouldn't come through the kitchen with your dirty boots on.
WE REGRET THINGS ARE NOT DIFFERENT NOW.
WISH + WOULD
WISH (ABOUT THE PAST)
WISH + SIMPLE PAST
PAST REFERENCE
EXPRESSING ANNOYANCE
I wish I hadn't said that. I can see I've upset you.
ANNOYANCE