Our apple tree fell down in the storm.

我们的苹果树在暴风雨中倒下了

The house looked as if it was about to fall down.

房子看起来好像就要倒塌似的。

Don't fall down again today.

今天别再跌倒了。

The house will fall down.

那屋子迟早要倒塌。

Have you ever seen a baby fall down?

你看到过小孩跌倒过没？

The sky won't fall down.

天不会塌下来。