A Door Sign

A few days ago, the senior assistant for curriculum of my school put up a sign on the front door of the teachers' staffroom.It read, " Please always keep the door closed". The sign caught the attention of all the English teachers. Teacher A: " The sentence is wrong. It should have been: Please keep the door closed always ." Teacher B: "No, it should have been Please keep the door closed. The word ' always ' is not necessary." An hour later. Teacher C: "My goodness, see how wrong the imperative is! It should have been 'Please always keep the door close ." Teacher D: " There's nothing wrong with the word 'closed'." Teacher C: "But the word 'closed' is a past tense word!" Teacher D: "It is not a past tense word. It's an adjective." Teacher C: "Whatever!" Two hours later. Teacher E: " Who crossed out the word 'closed' and wrote the word...