Why don't the sentences such as
I wish I were(was) rich.
I wish she were(was) my mother.
contain conjunction?
It seems to me
I wish if I were(was) rich .
I wish if she were(was) my mother.
are more correct.
Actually, you're on the right track, but using the wrong conjunction. The conjunction that is implied in both sentences:
I wish that I were rich.
I wish that she were my mother.
This word is commonly left out, since it is understood.
By the way, were is correct rather than was. Since you are expressing a hypothetical condition (you are not rich, she is not your mother), you use the subjunctive.
In this case you can use if only if you start a "new" sentence:
A: Hey man, are you buying that car?
B: I wish! If I had the money I would buy it right away!
I hope this example helps, as it has already been stated it's implied that, not if. You can find some useful informations here.
wish
is identical toif
. It's subjunctive. If you putif
there, then it needs other clause to complete sense.