Three years ago,i want to write a screenplay这是美国电影里两人对话的一段,为什么他说Three years ago而后面没有用过去式,这么说对吗.按语法来讲这么说对么,不对的话请指出并说明!

I started learing English three years ago.(对three years ago提问) I have known sandy since three years ago以 since three years ago ,提问 three years ago作文 I came to beijing three years ago.I()()()Baijing for three years it was i met miss white in hangzhou A:three years before B:three years ago that C:three years whenD:three years ago since I began to learn English three years ago.是什么时态 I have joined the club since three years ago I _____ this school since three years ago. I ——（hear)of the story three years ago. it was three years i met miss white in hangzhou A:three years before B:three years ago thatC:three years when D:three years ago sinceit was i met miss white in hangzhou i started to teach english three years ago= i ___ ____ ehglish ___ three years.(同义句） 请教three years later与three years ago的区别? Three years ago与Before three years的区别是什么? I bought the bike three years before和I have seen the film ago为什么错 I started to collect postcards three years ago (对划线部分——three years ago 提问)完成上面的填空 _______ ________ you ________ to collect postcards? three years ago 标志什么时态 one week of three years ago 对不对? Three years ago,we love go