Imperative SentenceTurn left!Guessing GameTurn right!Guessing GameWalk on the zebra crossing!Guessing GameGuessing GameBe quiet, please!Guessing GameDont play football!Guessing GameDont park your car!NO parkingGuessing GameDont eat!Guessing GameDont pick the flowers! Go upstairs!Guessing GameGuessing Game Go downstairs!Read and observe(观察)Turn left!Turn right! Please go upstairs! Go downstairs!Walk on the zebra crossing!Dont smoke!Dont play football!Dont park your car!Please dont eat!Dont pick