精选优质文档-倾情为你奉上高中英语情态动词用法归纳与练习A: can / could = be able to 1 表示能力两种时态can (could)，其他时态要用be able to的形式He can speak French.Was/were able to 可以表示成功做成某事的含义* managed to do / succeeded in doing With our help, he was able to build the house. 2 表示请求或许可 Could 比 Can 更加客气* mayCan I go now? Yes, you can.3 表示推测或可能性，常用于否定句和疑问句Can he be at school?Today is Sunday. He cant be at school.Cant couldnt/ Can ? Could? have done There is no light in the room. Can she have gone to bed?She cant have
