He didn't come home last night,his mother is extremely worri

He didn't come home last night,his mother is extremely worri He didn't come back home until 10 o'clock last night句型转换 选择:He didn't come back home ______ ten last night. he didn't go to bed ____ his mother came back last night中间应该 He didn't do home work () his mother came He didn’t come back home _____he finished his work. he didn't do his homework last night,so he did .还是so he didn He stayed at home last night.He didn't go to the cinema.(保持原 He didn't do his homework last night.He watched TV（改为同义句） He must have done his homework last night,didn't he? 这里为什么用d he must have finished his homework last night,didn't he?为什么是 last night Tom didn't come,but he ought to have怎样解析?