He works a plower plant.为什么works要加s?

He works a plower plant.为什么works要加s? he works in a factory He works like a dog. he works ____.A.hard B.hardly he works in a police station.急 He works in a factory同义句 He works in a university翻译 翻译：He works as a freelance artist. He works ( ) a car factory.He works ( ) a car factory.A.on B.of C.in He works in a factory,too.(改为同意句） He works in a factory_______ _______ He works in a school.对He提问 He is a doctor.He works in the h---- He works hard that he finds a job 同义句 He has a b___day.He works from morning to night He works on a farm.(改为一般疑问) Does he he works in a hospital能改写成he works in the hospital吗 A.pl:hover his father works in a barber's shop ,he works as a hair s____.