第一讲 情态动词 Step1 Lead in 1. Show some pictures and then answer the questions below the picture. The boy has been playing computers for three hours, what must the boy do now?What can she do?The room is in a mass. What shall the students do?2.List those modal verbs used in the above sentences.Step2 Presentation一、情态动词的特点：1、情态动词不能单独做谓语2、情态动词+V.原形3、没有人称和数的变化二、情态动词的基本用法：1、 can, coulde.g. He can speak English now, but he couldnt speak English two years ago. Can this
