No, but unravelling the correct usage here is tricky. Normally the verb agrees with the closest subject, which would yield You or I am mistaken, which sounds wrong; and so some people will say You or I are, which is barbarous but does not sound that wrong since we are used to hearing the equally barbarous "aren't I" ( which is a mistake inspired by reluctance to use the more correct but decidedly non-standard "ain't I"). Careful speakers will say Either you are mistaken or I am.
"Had got" is not considered correct grammar. It should be either "had" or "got," depending on the context of the sentence.
The correct grammar would be "Either you or I am wrong." This form matches the subject-verb agreement between "you" and "I."
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
Either form is acceptable.
I would say it was. It could be phrased- With you I shall depart. Either would be correct.
No, it is correct grammar, not a correct grammar.
The correct grammar is: "Are those correct?"
"On a train" is correct grammar.
The correct grammar for this sentence is: "When did you send it?"
No, the correct grammar would be "I hate you the way you hate me."
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
No, the correct grammar would be: "July has just started."