"You could not have been" is grammatically correct.
"You could not have been at the cinema last night, because I saw you in the park."
"He could not have been there" is the correct sentence. It conveys the idea that he was unable to have been at the specified place.
NO. These are correct; I could have punched I have punched I had punched I had been punched I have been punching I had been punching
No. It's only grammatically correct if one says "has been"
The word "trueful" is not a recognized word in standard English. The correct term is "truthful."
"You could have been a doctor" is correct. This sentence implies that becoming a doctor was a possibility in the past. "You should have been a doctor" implies that becoming a doctor was the correct choice in the past.
That is correct. You could also say: Tom has been unemployed for a month.
You have been travelling is correct. You would never say you have been on travelling, although for poetic emphasis you could say you have been travelling on.
Been is the past tense of the verb to be: I have been to the library. The term "of been" is not a correct phrase in English. Unfortunately, many people use it instead of "have been". For example, "I could of been an athlete." is incorrect; "I could have been an athlete." is the correct term.
I could not be more proud
"Could you kindly provide" is the correct phrase. The word "could" typically comes before the verb in English sentences.
No. "Him and I have been together." is not correct. The word him is an object pronoun, not a subject pronoun. The proper form of the sentence is "He and I have been together."
The correct form of the word "unite" could be "united" when used in the past tense or "uniting" when used in the present participle form.