Tom works in a TVstation(改为否定句

Tom works in a TVstation(改为否定句 Tom works in a TV station改为否定句 He works in a factory改为否定句 She works in a shop.（改为否定句） amy s father works in a school.(改为否定句) She works in a hospital.改为否定句 His mother works in a hospital.改为否定句 My sister works in a library.（改为否定句） My uncle works in a city near here（改为否定句）（改为一般疑问句） Tom is in China改为否定句 My uncle works in a restaurant.(改为一般否定句） Shi works in a car factory.改为否定句怎么改?