fall的过去式是fell.
根据时态fall down可以变成fell down. 扩展资料
The plan fell down because it proved to be too expensive.
这项计划因费用过高而告吹。
Many buildings fell down during the earthquake.
在地震中许多楼房倒塌。
The computer hood fell down to the floor.
计算机罩掉到了地板上。
