2、种:肯定的祈使句:e.g.Comein,please!请进!Sitdown,please.请坐。Let'sgohome.我们回家吧。GrammarLook out!小心!Wait here for me!在这等我!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!/Nosmoking!别吸烟!Whatschoolrulesdoyouknow?Wecan’t…