I finished my work yeserday 改为否定句.

I finished my work yeserday 改为否定句. I have finished my homework this morning.改为否定句 I have already finished my homework(改为否定句） She has already finished the work.改为否定句. Bob has finished his work already.改为否定句 she‘s already finished her work 改为否定句 he has finished the work already 改为否定句 They have already finished the work.如何改为否定句 David has already finished his work(改为否定句） my mother was at home yeserday（否定句） I have already finished the work.（变否定句） I finished my work.(改为被动语态）