I worked in factory for 10 years这句话语法有错吗?如果没错,该怎么翻译?

I worked in factory for 10 years这句话语法有错吗?如果没错,该怎么翻译? I worked in northwest China for many years 语法 为什么I had worked in a car factory for two years before I came Has Mr LI worked in this factory for 35 years?--Yes,he has.I He;s worked in this factory for many years It was in the factory----his father worked for 10 years ---- 这句英语有没有问题?Forget is a simple matter,for time【语法有没有错?如果没错这句话是 I worked in Shanghai for three years 这两句话有什么区别.she has worked in London for six years .如果换成has be My father worked in the factory for three years.(对for three 这句话语法有错吗?怎么改 I don't know how to start with it . 这句话有错吗?怎么翻译?（讲点语法知识）