问题描述： They do homework after school.怎么改成否定句和一般疑问句?如题! 1个回答 分类：英语 2014-10-10 问题解答： 我来补答 句子中没有be动词和情态动词所以要用助动词 doThey don't do homework after school.疑问句要把助动词放句首Do they do homework after school? 展开全文阅读
