saw seen怎么分?怎么用?

see的过去式 See的过去式有两个吗?seen saw 怎么讲?请具体点, I saw him this morning.与I have seen him this morning 怎么翻译,区别 比如动词see .有的形式会写成saw seen seeing 这些各应该怎么称呼.就比如什 I saw him going to the office .的被动语态怎么改?是He was seen to goin 在英语现在完成时中,什么时候加has/have?怎么有的过去式是have seen,而有的却是saw? saw sb doing/do怎么用 saw elephants怎么读 fox saw 怎么读 saw英语怎么读 ...has been seen as...这个句型怎么用? Has anyone ever seen dinosaurs?怎么用否定形式回答 It was years since i had seen her.此处为什么是had seen ,可否用saw代替.