What is she doing for vacation?为什么要用for额?

what is she doing? What is she doing? What she is doing? 曲别? what is she doing in What is she doing?翻译成中文 what is she doing?课文翻译是什么 What is she doing 怎么回答 what is she doing this morning? what are she doing ? she is dancing那里出错了 what's she doing?- she is s___ the floor what is she doing这里为什么用is? what does she doing? What,s.she.doing? what ()she doing today? what she doing?英译汉 What is she doing?she is sleep.Whattime is it now?It is 连词成句there what is she doing What does Mary doing?She is eating.错在哪 What is he(she) doing on sunday?怎么翻译