问题描述： He doesn't do his homework at home.(改为肯定句） 1个回答 分类：英语 2014-12-10 问题解答： 我来补答 He does his homework at home因为does是助动词,变否定句时需要,肯定是去掉,He是三单,所以用does 展开全文阅读
