She is doing homework.这里面doing是现在分词,此时is后面的结构是表语吗?

what is she doing? What is she doing? What she is doing? 曲别? what is she doing in 按对话意思完成句子.Mary:Hello!John's sister:Hello!_____________________.Mary:This is Mary?Mary:Hello!John's sister:Hello!_____________________.Mary:This is Mary?_____________________.John's sister:_____________________ ,John is doing homewor What is she doing?翻译成中文 what is she doing?课文翻译是什么 She is doing her homework的提问 She is doing her homework.改为复数 What is she doing 怎么回答 what is she doing this morning? She is doing some washing的问句 She is doing ervironment r首字母填词 翻译“She is doing some cooking now she shouldn't forget to do her homework改为同义句：she () () () () to do her homewor she is doing her homework.she said宾语复合句 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?