wish was or were?

[atabitaraf]

Should we use 'were' after wish instead of was? and for all persons?
1. I wish I were on the moon.
2. I wish I was on the moon.
3. I wish I were a bit more rich.
4. I wish I was a bit more rich.

[bhaisahab]

Should we use 'were' after wish instead of was? and for all persons?
1. I wish I were on the moon.
2. I wish I was on the moon.
3. I wish I were a bit more rich.
4. I wish I was a bit more rich.

This question has been asked and answered many times on the forum. Type "was or were" into the search box in the top right hand corner of the page, you will get a lot of excellent answers.