Question

یا نباش یا اگه هستی ادای بودنو در نیار به انگلیسی چی میشه؟

Answer 1

Either be absent or if you are present , don't (just) personate it.

Answer 2

Either don't be, or if you are, don't pretend to be!

Comments

You're welcome buddy.

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Note that if they were wrong that forum would be closed long ago. If what you say is supposed to be true, no teacher and professor can't be correct at all when giving their opinions with regard to English language. If you don't accept their answer, prove it if you can. If you can't prove it, so you must accept the truth.

Take a look at this page:

http://forum.wordreference.com/threads/either-dont-be-or-if-you-are-dont-pretend-to-be.3219153/#post-16293591

 

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It's grammatically correct. Whether it "makes sense" depends on the context.

It is related to romantic relationships.
Lover is telling her beloved " either stay with me or leave, but if you stay, don't pretend to stay with me.
By "either be", the writer( a friend) he means "either stay with me".

You have told that I meant stay, but I did not mean stay; I exactly meant exist. 

And one more point, if they say it is wrong (and they have not), they are in fact saying that the Shakespeare's phrase: "to be or not to be." is wrong.

Incidentally, I do not have more time to argue with you about this subject.

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  Means 'to stay'باش 

in above case.

Shakespeare's to be or not to be is a different case.

I'm not arguing I'm just explaining.

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I think that "باش" means "be" here, you think another thing; I do not think (but I am not certain) that "be" can mean "stay", so our discussion is totally off, yet even if "be" has that meaning, in this case it needs something to follow it, and we do not have anything more to discuss.

Answer 3

Either become non-existent or stop pretending that you exist if you do exist.