we are able to do ...这里不定式是什么成分?补语还是状语

we are able to do ...这里不定式是什么成分?补语还是状语 Are you able to do these? How are you able to do that?怎么翻译? they do well in the exam.A.can be able to B.be able to C.can able to D.are able to 选哪个? why we people from Chinese mainland are not able to win Nobel Prize?不要翻译,例:Because foreign people do not understand our Chinese culture I firmly believe that we have been able to follow the we are get together We have a lot of time.We____do it well.A able to B will be able to C are able to D bothBand C If you are able to do something,you ____ do it What are we going to do today? What are we going to do now? be able to do sth We are free to go anywhere we want,we are free to do anysthing we want I am writing to ask whether you are able to do me a favor. We won't be able to do the job well _____(没有) your help. we are able to finish our homework tomorrow morning为什么这个句子不是we will be able to finish our homework tomorrow morning 为什么注册facebook提示：Sorry,we are not able to process your registration. 请高手翻译下 We are able to reach an unreachable child. are we able to market these in Australia这句该怎么翻译比较好?