请问 fall down fall off fall away有什么区别?

1)跌倒 eg. fall down the stairs 2）掉落 eg. his shirt button is falling off 3）远离 eg. You fall away from your past

Fall off 强调的是本来长在或者附在什么东西上，现在掉下来了，leaves fall off the trees Fall down 后面一般不加任何词了，i fell down，摔倒了，不需要强调从哪里或者在哪里摔 fall away 主要用指精神层面或者的跌到和跌落（思想堕落），that time many will fall away and will betray one another and hate one another 那时必有许多人跌倒、也要彼此陷害、彼此恨恶

分析方法：语境与 字面
抓住 down off away 三者的区别
fall down

倒塌; 跌倒
Many buildings fell down during the earthquake.
在地震中许多楼房倒塌了.
失败
His plans have fallen down.
他的计划失败了.
fall off
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.
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.
减少
The number of passengers by this line fell off slightly in January.
一月份这条航线的乘客数量略有减少.
变坏; 恶化
The cooking fell off remarkably.
烹饪质量大大降低.
逐渐消失, 死亡
Words fall off by disuse.
词不用就会成为废词.
不再支持; 叛离
His friends fell off one by one.
他的朋友一个一个地跟他疏远了.
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.
fall away
离开
All his old friends fell away from him.
他的老朋友全都离开了他.
消瘦
You'd scarcely believe anybody could fall away so rapidly.
你简直难以相信一个人会消瘦得这么快.

fall down是掉下来，强调下来。而fall off 是强调脱离原来的方位，强调分离的结果。fall off 是强调远离现在的位置，强调的是距离。