Grammar Note
常用搭配 fall off something，表示从某物上掉下来或下降。
掉下；脱落
先理解核心含义，再看它在真实句子里的用法。
掉下；脱落
to drop or become detached from something
He fell off the ladder but luckily wasn't hurt.
他从梯子上摔了下来，但幸运的是没有受伤。
脱落；掉下。
To become detached or to drop from.
减小；下降；变差。
To diminish in size, value, etc.; to get worse (in quality).
改变帆向以更顺风；使船首转至下风。
To change the direction of a sail so as to point in a direction that is more down wind; to bring the bow leeward.
堕落；误入歧途。
To fall into sin; to stray.
fall off
Base
原形
falls off
3rd person
第三人称单数
falling off
-ing
现在分词
fell off
Past
过去式
fallen off
Past participle
过去分词
Prices fall off quickly.
价格快速下降。
He fell off his bike.
他从自行车上跌下来了。
Sales have fallen off this month.
这个月销售额下降了。
注意：*fall off* 是不规则短语动词，过去式和过去分词分别为 *fell off* 和 *fallen off*。
The picture frame fell off the wall when I closed the door.
我关门时相框从墙上掉了下来。
In autumn, leaves fall off the trees and cover the ground.
秋天，树叶从树上落下，覆盖了地面。
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常用搭配 fall off something，表示从某物上掉下来或下降。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.