see的過去式和過去分詞是什麼求教

　　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.

　　你能聽到鋸子鋸進骨頭裡的聲音。

　　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於一旦。

　　Down through the years this town has seen many changes.

　　這些年來這座城市發生了許多變化。