Wish Clauses

We use

"I wish" 

to express 

regret 

or 

dissatisfaction

FOR THE PRESENT AND FUTURE

We use

"I WISH" + PAST SIMPLE OR PAST CONTINUOUS 

I wish I had more money

I wish I weren't working at this moment

FOR THE FUTURE

Showing that it is not likely to happen

We use

"I WISH" + CONDITIONAL

I wish I would go to England next summer

FOR THE PAST

We use

"I WISH" + PAST PERFECT

I wish I had studied more for the exam

I wish I hadn't lied to my friend

IF THE WISH IS A GOOD ONE

We use

"I HOPE" + PRESENT SIMPLE OR WILL

I hope you feel well

I hope the war will stop soon

IF THE WISH IS ABOUT DOING SOMETHING DIFFICULT OR IMPOSSIBLE

We use

I WISH I COULD...

I wish I could hear it

I wish I could pass this subject

WE CAN REPLACE I WISH WITH IF I ONLY  FOR EMPHASIS

If only I hadn't watched that film

If only I could speak English well

EXERCISES

http://www.better-english.com/grammar/wish1.htm

http://www.better-english.com/grammar/wish2.htm

http://www.better-english.com/grammar/wishes.htm

http://www.english-grammar-lessons.com/wish/menu.php

http://www.imparareinglese.co.uk/esercizi_inglese.htm