He is doing his homework with me的复数

He is doing his homework with me的复数 he is doing his homework 改复数 He is doing his homework .变复数...谢谢!快点啊 he is()doing his homework He is doing his homework He is doing his homework .翻译 He is j___ doing his homework. He is j___ doing his homework He is doing his homework 中文 He is b_____ doing his homework He told me that he _____(finish) doing his homework what's David doing?——He is b with his homework.后面加什么?