You're using the predicate nominative, so the pronoun should technically be in the nominative case (i.e. "If you were I"), but English speakers almost universally say and write "If you were me." "If you were I" sounds very stilted and many grammarians concede that the rule is changing.
Both verbs are correct, with different meaning. The subjunctive if I were is used to express a contrary-to-fact condition in the present: If I were he, I would be someone else. The declarative if I was he would be for a condition in the past that is not known to be contrary to fact: If I was he, who were you? The latter usage is rare, naturally.
No, it is not correct to say "I were" or "You is" in a proper sentence.
I disagree. In the subjunctive tense, it is grammatically correct to say, 'If I were you'.
Grammaticly is not a word. The correct word is grammatically.
'I was' and 'you are'
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.
Yes, this is grammatically correct.
no it is not grammatically wrong but it is better to ask where are you if you want to use it in question...
"Not like that" can be grammatically correct, depending on the context.
Yes. It is grammatically sound.
The phrase "Is you don't miss me do you" is not grammatically correct. It should be rephrased to something like "Don't you miss me?" to be correct.
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
"Off you go" is not grammatically incorrect.
Yes, Almighty God is grammatically correct.
Yes, this is grammatically correct.
"That was wrong" is a grammatically correct sentence.
Yes, it is grammatically correct.
no it is not grammatically wrong but it is better to ask where are you if you want to use it in question...
The sentence "Rhoda's Crazy" is not grammatically correct. It is missing a verb to make a complete sentence.