Mr Li is a worker.改为否定句

Mr Li is a worker.改为否定句 He is a worker.(改为否定句,疑问句和回答) She thinks the bag is Mr Li＇s(改为否定句) He is a worker改为复数句 Mr Chen is a worker. Mr Wang is “a worker”. he is a factory worker.改否定句怎样改 shi is a woman worker.(改为复数句） My brother is a worker.l am a worker,too.改为同义句 Mr Smith is taking a walk in the park.改为否定句和一般疑问句 将下列句子改为否定句、一般疑问句、肯定回答、否定回答：he is a nurse. we are friends.li Mr Li is a policeman.(同义句） Mr Li _____ _____ a policeman.