fall off = fall down from,为什么fall down 后面非要加from ,求详解.

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fall off = fall down from,为什么fall down 后面非要加from ,求详解.
fall off = fall down from,为什么fall down 后面非要加from ,求详解.

fall off = fall down from,为什么fall down 后面非要加from ,求详解.
举例 fall off the bike 从单车上摔下来,off 表示从...下来
fall down 表示下落跌落,是不及物的,必须加上from表示从...

因为fall是vi. 即不及物动词 fall 本意下落，下降。down是副词下降，向下。合在一起 fall down 是向下落，加上from,才能带宾语。如 fall down from the tree/building

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