tenses - "If I were" or "If I was"?

Possible Duplicates:
“If I was” or “If I were”. Which is more common, and which is correct?
“Was” versus “were”—word usage

Which one is correct:
"If I were a cop, I would wear a uniform"
OR
"If I was a cop, I would wear a uniform"?

Answer

if I were

This we call the second conditional utilising the subjunctive form, which can be used to discuss hypothetical/unreal situations.

If I were a cop, I would wear a uniform implies that I am not a cop and so I don't wear a uniform.

if it was

This would be the beginning of a question about a past event, for example:

If it was raining, why did you go out? meaning that it rained and you went outside; the speaker is questioning your motives.

Hope that helps