roofs这个比较特殊，不能把F变成V再加ES

roof：复数： roofs

n.顶部;屋顶;车顶;有…顶的;洞顶;隧道顶

v.给…盖顶;盖上屋顶

第三人称单数： roofs现在分词： roofing过去式： roofed过去分词： roofed

例句：

The wind dislodged one or two tiles from the roof.

大风从屋顶上刮下了一两片瓦来。

The roof of the car was not damaged in the accident.

事故中，车顶没有遭到损坏。

The pillars gave way and a section of the roof collapsed.

这些立柱坍塌了，一部分屋顶坠落下来。

The stone made a dent in the roof of the car.

石头把车顶砸了个坑。

The sound was magnified by the high roof.

高高的屋顶使声音更响亮。