Doing homework is not my hobby.为什么do要加ing?

brother homework is doing but There is no excuse for not doing your homework 这里do为什么要用doing Is Nancy doing her homework?Yes,she is/No,she isn’t 翻译! is sallyd doing her homework She is doing her homework的提问 She is doing her homework.改为复数 He is doing his homework 中文 He is doing his homework .翻译 Kate is doing homework.(改为一般疑问句) he is()doing his homework速求! He is j___ doing his homework He is b_____ doing his homework Bill is in the classroom,doing( )homework he is doing his homework 改复数 His sister is doing her homework 对her homework 提问 lily is doing her homework对ding her homework提问 He has no free time now.He is doing his homework.把两个句子合并在一起.He_____ _____ _____his homework.请补充空格, kevin is doing his.homework right now.改为同义句kevin is doing his homework