fall,摔倒,跌倒
过去式:fell,过去分词:fallen
fαll过去式是:fell
v.
落下,跌倒(fall的过去式)砍伐,打倒
例句:
More than 100 trees were felled in just over an hour.短短一个多小时里超过100棵树被砍倒。
The goalkeeper was felled by a coin thrown from the crowd.守门员被人群中扔出的一枚硬币击倒
他扶住椅子后背,以免摔倒。He held onto the back of the chair to stop himself from falling
在英语词汇中摔倒的过去式和原形分别是fall down, fell down 
“摔倒在地上”用fall on/onto the ground. 表达,或者只用fall over(摔倒),不加地点。 fall over(sb./sth)是被绊倒的意思。 fall over yourself to do 则是不遗余力去做某事
例句:
The sky won't fall down.天不会塌下来。You almost fall down, but not really.你差点儿跌倒,但是并没有跌倒