be able to后为什么可以加doing?在句子：You'll be able to make a living doing something you love.中的to.+doing 是什么意思?解析一下语法!

be able to后为什么可以加doing?在句子：You'll be able to make a living doing something you love.中的to.+doing 是什么意思?解析一下语法! No one加be able to,还是is able to? be able to 后面能不能加形容词 be able to可以省略to么? as we all know,he would not be able to live without you.为什么用would not be able to 怎么不用will not be able to 　是什么理由?可以用may　not　be　able　to Be able to 后加动词原形还是动词ing形式? The girl ran up to me,barely able to catch her breath.女孩跑向我,跑得上气不接下气.able 前面可以不加be的吗? I will be able to为什么要用be而非I will am able to If she were alive today she would not be able to...today后需不需要加逗号? be able to 用法 be able to中文 able to be assigned be able to be able to (送分拉) 请问：be able to be able to 意思 为什么用would be able to ,如果用was able to 可以吗Byrd now knew that he would be able to reach the South Pole which was 300 miles away,for there were no more mountains in sight. i haven't been able to answer his letter.perhaps i would next week这里用would 为什么不行,will be able to 怎么可以?