see的過去式和過去分詞是什么求教

　　He accidentally sawed through a cable.

　　他不小心鋸斷了電纜。

　　You can hear the saw as it cuts through the bones.

　　你能聽到鋸子鋸進(jìn)骨頭里的聲音。

　　The last time I saw him was in May.

　　我上次見到他是在五月份。

　　Have you seen today's paper?

　　你看到今天的報紙沒有？

　　He had seen his life's work destroyed before his very eyes.

　　他曾看到他畢生的勞動成果就在自己的眼前毀于一旦。

　　Down through the years this town has seen many changes.

　　這些年來這座城市發(fā)生了許多變化。