Falling past tense
掉下来───Fall off;过去时───past
It's important to tighten up the wheels properly, otherwise they vibrate loose and fall off.───把车轮拧紧很重要,否则它们会振动而松脱。
One slip and you could fall off the building.───脚下一滑就可能从建筑物上跌下去.
In autumn the leaves wither and fall off the trees.───秋天,树叶枯萎并从树上落下来.
Cyclists who swerve to avoid dogs may fall off their bicyles.───骑自行车转向躲狗的人非从车上摔下来不可.
You'll break your neck if you fall off the roof.───你要是从屋顶上跌下来会摔死的.
My bicycle bell is apt to fall off when I ride too fast.───我骑车太快时,自行车的铃老爱掉下来.
When you are learning to ride a bicycle, you often fall off.───初学骑自行车时, 常会从车上掉下来.
Words fall off by disuse.───词不用就会成为废词.