lie的过去式和过去分词是什么？

　　例句

　　Go and lie down for a while.

　　去躺一会儿吧。

　　I found her lying on the ground.

　　我发现她躺在地上。

　　You could see from his face that he was lying.

　　从他的'表情上你可以看出他在说假话。

　　I'll lay you any money you like he won't come.

　　我看他不来了，你愿意赌多少钱我都奉陪。

　　His book explains the theory for the lay public.

　　他的书为大众阐明了这个理论。