判断句:肯定句用must, 否定句用can't, 不太肯定用may, might He must be in the office now. He must have gone to bed, for the light is out. He can't be in the office. He is at home. He couldn't have cleaned the classroom, because he didn't come here today. He might be in the office, I am not sure. He might have cleaned the room, I suppose. 句子种类 I． 要点 句子按使用目的可分为陈述句.疑问句.祈使句和感叹句,按结构又分为简单句.并列句和复合句. 【查看更多】
