Question

fall down，fall over，fall off有什么区别？

Answer 1

fall down (v.+adv.)
1. 倒塌; 跌倒
Many buildings fell down during the earthquake. 在地震中许多楼房倒塌。
Babies often fall down when they learn to walk. 婴儿在学走路时经常摔倒。
2. 失败
The plan fell down because it proved to be too expensive. 这项计划因费用过高而告吹。
You are likely to fall down on your research project if you don't go to the experts for advice. 如果你不去向专家们请教,你的研究项目很可能夭折。

fall over (v.+adv.)
1. 意外地落下,倒下或被绊倒
I saw the little girl fall over and hit her head. 我看到这小女孩绊倒了,碰了头。
Take care!Don't let the child fall over. 当心!不要让孩子跌倒。
The moment the tiger got shot, it fell over on its side. 老虎一中弹,就侧身翻倒在地。
2. 睡着
He awakened me when I had just fallen over . 我刚睡着,他就把我叫醒了。

fall over (v.+prep.)
1. 意外地从(陡峭物)上跌落,掉下来
The car fell over a cliff and the driver was drowned.轿车从悬崖上翻下来,司机溺水而亡。
A hush fell over the onlookers.旁观者们突然静了下来。
2. 被…绊倒
He fell over a rock in his path.他在小路上被一块石头绊倒了。
When a man is drunk, he often falls over his own feet.一个人喝醉了酒,常会绊倒自己。
3. 迫不及待做某事
Mother fell over herself to get the party ready.母亲急切地为聚会做准备。
The children fell over each other to take the parcel from the postman.孩子们争先恐后地从邮递员那儿把包裹拿过来。
落在…之外 drop beyondfall over sth
The ball fell over the line.球落在线外。

fall off (v.+adv.)
1. 跌落,滚落下
When you are learning to ride a bicycle, you often fall off. 初学骑自行车时,常会从车上掉下来。
One of her shoes fell off while she was making her way through the crowd. 她从人群中挤过时,一只鞋掉了。
2. 突然降低; 向下斜
The land falls off here towards the river. 这儿的地势朝河的方向低了下去。
3. 减少
The number of students has been falling off recently. 近来学生数目越来越少了。
Interest in the game has fallen off. 人们对这游戏已经不那么感兴趣了。
Visitors had fallen off to nothing last week. 上周游客减少了,几乎没有一个人来。
4. 变坏; 恶化
The cooking fell off remarkably. 烹饪质量大大降低。
The quality of performance has fallen off since last year. 自去年以来,演出水平一直在下降。
5. 逐渐消失,消亡
This old custom has fallen off here. 这一旧风俗在此地已经废弃了。
6. 不再支持; 叛离
Some of our most loyal members now have fallen off. 我们以前的一些最忠实的会员都背弃了我们。
7. 变瘦; (健康、精力等)衰退
He took care to keep the cattle from falling off. 他精心照料着牛群,不使它们瘦下来。
That old woman's health began to fall off. 那老妇人的健康开始衰退了。

fall off (v.+prep.)
1. 从…(滚)落下或脱落
A button has fallen off my coat. 我的外衣掉了一颗扣子。
I laughed so hard I nearly fell off my chair. 我笑得差点儿从椅子上掉下来。
2. 吃惊
I could have fallen off my chair when Kent walked in after all those years! 多年不见后,肯特突然走进来使我大吃一惊。
3. (动物)失去对…的食欲
Give the cow a dose when she falls off her food. 这头母牛食欲不振时就给它一剂药吃。

Answer 2

fall
down强调的是“滑倒、倒下”，后接宾语时应加上介词from。
fall
off强调的是“跌落、从……掉下来”，后直接接宾语。
fall
over强调的是“向前摔倒、跌倒”。