build的過(guò)去式過(guò)去分詞和名詞

build的過(guò)去式過(guò)去分詞都是：built；
build本身就是名詞。
例句：
Most of the houses are built of stone.
這些房子多數(shù)是用石頭建造的。
The school was built in the late 1970s.
這所學(xué)校建于20世紀(jì)70年代末。