can与be able to的时态上的区别

can与be able to的时态上的区别 can与be able to的区别 be able to与can 的区别 be able to 与 can的区别 can 和be able to的时态上的区别是什么?要有例句一定要有例句啊! can 与be able to 的具体区别 和 用法 can和be able to的区别 be able to、can、could的区别 can和be able to 的区别 be able to和can的区别 be able to ,can,may的区别 请问they have been able to do的时态是什么?been able to 和 be able to的区别是什么? be able to 和 can 分别用于那种时态? 一道英语选择题,新概念第二册同步测试卷上的1.They ______ do well in the exam.A.can be able to B.be able to C.can able to D.are able to记着说明理由 be able to 是什么时态 be able to的用法be able to和can的区别和用法 can.be able to.manage to 的区别can,be able to 都表示能力be able to manage to 也都有成功做到的意思 怎么区别 can,could和be able to的区别