Alice finished doing her homework just now.为什么要用doing形式呢?

Alice finished doing her homework just now.为什么要用doing形式呢? have you finished doing是什么意思 “what are you doing?”asks Alice中能说Alice asks 吗? 结束做某事是finished do还是finished doing have you finished doing有吗 They have all finished doing the exercises 语法题1．I decide to go to the library as soon as I ( )1．I decide to go to the library as soon as I ( )A.finished what I was doing B.finished what I didC.would finish what I was doingD.finish what I did2．－－Alice came back home the day bef He has his work.A.finished do B.finished done C.to finish doing D.finished doing选择哪个,理由 Alice,what were you doing when the fire started Alice isn't doing her homework.She's w______ aletter? is ,Alice ,doing ,table ,tennis ,now ,what ,she's ,playing~ how are you doing in your studies,alice Alice alice Alice had some difficulty --- her job yesterday.1 finish 2 finishing 3 to finish 4 finished 有will be finished doing这种用法么? something worth doing should be finished in our lifetime.这里finished为什么要改为completed? I have finished packing my suitcase finished pack 为什么是doing?