Fall down 表示摔到地面或地板上，可以描述一个人失去平衡，也可以描述原本站立的物品倒下。说旧房子或棚屋 it's falling down，则表示它正在破败、坍塌。
想在对话中用 fall down 吗？
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fall down (on the ground); fall down + the stairs/a hole; building + be falling down; fall off + bike/horse/chair
- Our little daughter fell down in the park, but she got up and kept running.
- He missed a step and fell down the stairs, but luckily he only bruised his arm.
- Nobody has lived in the old farmhouse for years, and it's slowly falling down.
修改原因
修改前My son fell down from his bike and hurt his knee.
修改后My son fell off his bike and hurt his knee.
从原本坐着或站着的东西上摔下来，例如自行车、马或梯子，通常使用 fall off：fell off his bike。这里不需要 down 和 from。但从楼梯上一路滚落，则说 fall down the stairs。
描述价格、数量或温度下降时，通常直接用 fall，不加 down：House prices fell last year。Fall down 则用于这里的实际倒下：The old fence fell down in the storm。
动手练习
The ice outside the office was so slippery that two of my colleagues ___ this morning.
查看答案
fell down — 同事是在冰面上滑倒，摔在原本站立的地方，不是从某样东西上掉下来，所以选 fell down。这里用 fell off 会需要一个脱离的支撑物或相应语境，例如 fell off a ladder，而题目没有这个意思。
回想一次你或认识的人在冰面、健身房或徒步时摔倒的经历。说明发生在哪里，以及结果怎样。
Last winter I fell down on the icy steps outside my office, but I only hurt my wrist a little.
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