fall的過去式是什么

　　雙語例句

　　1.Totally exhausted, he tore his clothes off and fell into bed.

　　他疲憊至極，扯下衣服，一頭倒在床上。

　　2.Output will fall by 6%.

　　產量將減少6%。

　　3.There's a danger of the government falling because it will lose its majority.

　　政府將因失去其占多數的優(yōu)勢而有倒臺的危險。