The right answer to the question "What's this/that?" is 'It's a...' , not ...(See details) The right answer to the question "What's this/that?" is 'It's a...' , not "This/That is a...". But what about plurals? How should we ask and answer about "These" and "Those"?

Is it a mistake if you answer "Great, thank you. And you?" to the question "How do you do?"

"That's all" and "that's about all" - are they the same? Is the second expression more polite?

What's the difference between FACULTY and DEPARTMENT, say, Psychology Faculty or Department of Psychology?

."How do you do"- can we ask this question every time we greet people ? 1."How do you do"- can we ask this question every time we greet people or it is good only during the first meeting with a person when you are making the acquaintance? 2.When smb tells you "How do you do", you usually answer with the same words. Are there any other possible ways of answer? For example, "Great, thank you. And you?"