英语:谓语 ,宾语,主语,助动词,情态动词,分别是什么,?怎么用?答:9、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...