I could not be more proud
Not really. Bad American English has formed such a word. The correct way to say "prouder" in a sentence is "I have never been more proud ... "
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
Either could be correct, depending on context. "The thief has been located in the library." (The thief is inside the walls of the library.) "The thief has been located at the library." (The thief could be anywhere on the library grounds.)
No, that is not correct. First of all 'much' is wrong with 'they'. It could have been "How many are they?. But if you have to ask the price of something you could ask- "How much is it for?" or "How much do they cost?" for more than a single item. In an informal way you might ask "How much for them?" or just "How much?"
"Has been" is correct, because "a block" is singular.
Not really. Bad American English has formed such a word. The correct way to say "prouder" in a sentence is "I have never been more proud ... "
"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
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.
"How long have you been playing tennis?" is the correct phrase to ask about the duration of someone's tennis experience.
"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.
D.All of the above are correct.
Add a semicolon after 1800s. Also, the verb tense is wrong -- instead of "have been produced (present perfect), it should be have been produced.
It is correct to use "have" with the plural subject "you and your family". For a correct sentence, you could say, "I hope you and your family have a nice evening."