Possible Duplicate:
“If I was” or “If I were”. Which is more common, and which is correct?
I am unsure whether to use "were" or "was" in the following instances
Instance 1:
If I were you
or
If I was you
Instance 2:
If I were her
or
If I was her
Instance 3:
If I were a monkey
or
If I was a monkey
Does it differ between forms of English (British, American)?