核心问题
（1）And then I watched all the glasses that were on the table fall off onto the floor.
(2) The house moved and a few pictures fell off the wall, but that was all.
句(1)和句(2)中的fall off用法相同吗?
词典解答
句(1)的 fall off(掉落)中的 off 是副词,因此,其后不要求带宾语(句中的介词短语 onto the floor 是方向状语)。而句(2)中的 fall off(从……掉落)中的 off 是介词,要求带宾语(the wall)。请分清下列各句中 fall off 的用法:
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When you are learning to ride a bicycle, you often fall off. 学习骑自行车时，常常会摔下来的。
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Leaves fall off the trees in the autumn. 秋天,树叶纷纷从树上掉下来。