Tom was doing his homework——his mother was cooking

Tom was doing his homework——his mother was cooking his when Tom dinner came mother cooking was home I was doing my homework,my mother was cooking in the kitchen i was doing my homework while my mother (was cooking)为什么不填co i was doing my homework while my mother was cooking不是一个句子不能有 He was busy ___ (do)his homework while I was cooking she was his mother. he said what he was doing his homework He fell asleep while (he was) doing his homework jack was doing his homework at that time He was doing his homework yesterday afternoon 改为否定陈述句 he was doing his homework yesterday afernoon改为否定