精选优质文档-倾情为你奉上情态动词总结I 情态动词的特征：1. 本身有词义。2. 不能独立作谓语。2. 后接动词原形一起构成谓语。3. 不随人称和数的变化。II 情态动词各自的基本意义及用法：1. can 与could用法对比点can could1、表“能力”Can you lift this heavy box?I couldnt understand what he said at all.2、表“许可”You can use a different material instead.He said I could borrow his bike.3、“怀疑”No, no, it cant be true.What on earth can this mean?We thought the story could not be true. How could you be so careless?4、can与be able to 区别1. could代替 can，表示语气更为婉
