祈使句祈使句的肯定句式 1.Do 省略主语，实意动词作谓语 Look at the line! It is very dangerous to cross it! Keep your eye on the sky at the Astronomy Club!2. be 动词 + n./adj/prep. phrase 省略主语，be 动词作谓语 Be careful! There is a huge Frisbee （飞盘 ） coming through the campus!3.Let 宾语( 人/ 物) do Letitnotbejustthebeginningofmy dream,butthebeginningofallofour dreams.祈使句的否定句式 1.Dont/Neverdo Dont/Neverbe Dontcrossoverthatsafetyline. Nevergetcaughtbythelibrarian.2.Nosth./doing NopeepingattheMonstersInc. NophotosattheMonstersInc.一般用will
