伊宁市城市规划:what do we call a sentence that gives a command or makes a request

what do we call a sentence that gives a command or makes a request What can we do with a computer what do you call a deer without eyes? what can we do ? what do we call the symbols used in ancient Egyptian writing? what do we call pieces of stone that enter the earth's atmosphere in grammar ,what do we call the words"and,but,and,or" what do we call the two words at the top of each cictionary page what do we call words that sound the same but have different meanings and spellings what part of a watch do we use when we greet someone ?