After a blow of wind,you can see a lot of fallen (leaves) on the (roofs)

问题描述:

After a blow of wind,you can see a lot of fallen (leaves) on the (roofs)
这里的落叶复数很好理解
那为什么屋顶也要复数

因为落叶不知落在一个屋顶上
其实这个不必深究,一般习惯加个S