My father (work) in a factory for five years.But now he is a teacher.这里为什么要用worked呢?能不能具体解释下原因

my father goes to work in foot every day改错 my father goes to work in foot every day改错 My mother and father work in a school My father and mother work in No.1 Middle S______. my father often helps people in his work 改成疑问句 My father is s___with me and in his work My father goes to work in a car.对in a car划线部分提问------- ------your father-----to work? My father is a .He is work in offiMy father is a .He is work in officer. my father goes to work in beijing to work m( ）for our family 改错My father is an engineer work in a big company为什么把work 改成working My father is a_____ work. I work in this factory ,and so does my father.为什么用so does my fatherA so does my father B so my father does C so is my father Dso my father is my father worked for the IMB Company in the past保持原义.My father ------- --------work for theIMB Company. My mother and father work in a school .(对in a school 提问 强调句It is where my father works that I work.It is where my father works that I work in.哪个对?为什么呀. I work in this factory ,and——A so dose my fatherB so my father doseC so is my fatherD so my father is理由 my father goes to work in a car.（划线部分提问）in a car.————your father——to work? my father goes to work ( ）his cara.in b.byc.on