6、定和否定两种:e.g.Look out!小心!Wait here for me!在这等我!GrammarComein,please!请进!Sitdown,please.请坐。Let'sgohome.我们回家吧。否定的祈使句是在动词原形前(即句首)加Don't.e.g.Don'ttalkinclass!不要在课常上讲话!Don'topenthewindow!别开窗!Don’tarrivelateforschool.上学别迟到!Don’tsmoke!别吸烟!SCHOOLRULES1.Don’tarrivelatefor