i saw a piece of glass fall down when i walked past the office为什么不用falling down

问题描述:

i saw a piece of glass fall down when i walked past the office为什么不用falling down

这句话的意思是:我走过那间办公室时,看见一块玻璃掉下来了.
强调的是结果“块玻璃掉下来了”,不是强调的状态.