fall的过去式是什么

　　双语例句

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

　　他疲惫至极，扯下衣服，一头倒在床上。

　　2.Output will fall by 6%.

　　产量将减少6%。

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

　　政府将因失去其占多数的优势而有倒台的危险。