WHEN I WAS READING I HEARD SOMEONE -----(KNOCK)AT THE DOOR为什么WHEN后加ING不是在I HEAR后加吗/告诉我规律括号里的也要填!谢谢!

When I was young,I liked reading fairy tales very much同义句 I () () () reading fairy ... I came in when she was reading 为什么错了? when I was reading the newspaper,the phone rang.与 I was reading the newspaper when the phone rang.when I was reading the newspaper,the phone rang.与 I was reading the newspaper when the phone rang. （the teacher came in when I was reading)是否正确 I was playing the piano when I was reading nespaper.这里到底用when还是while. He was heard() out (go)When I was reading a book.he was heard () out.(go) I was reading ___ I heard someone calling my name.A while B when when I was young,I liked reading fairy tales very much.的同义句 When I was reading a book,I saw somrthing interesting .这句话对吗? When I ,he in his room.A.was sleeping:was reading B.slept:read C.was sleeping:readed D.slept:was reading She was reading a novel when I came in.(改为否定句） She_______ ________a novel when I came in.---------------------- it happened that i was reading upstairs when he came in的同义句 when i was reading jim _______(came) into my roomcoming 是错的 I was reading ____ (A when,B as)the light went off. when i was reading ,the clock ---12 o'clock.strike 应该用什么形式 One day ,I was reading a newspaper when my wife called,--------------完形填空（答案） My uncle was reading () when I came home.A.some paper B.a morning paper I was playing the piano when I was reading nespaper.这个句子可以变成```I played the piano when I readed news paper.