1.the bridge is built of stone.请问这个句子中的 built 是什么词性,是名词吗,怎么不

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1.the bridge is built of stone.请问这个句子中的 built 是什么词性,是名词吗,怎么不用原形build 的
2.i have to go away on business for three days.请问这个句子中on business 是做什么词性用的?能不能这样表达i have to go away to on business for three days.离开的目的是出差.
3.she often plays the piano at school shows?请问这句中的 at school shows是做为一个地点吗?

uilt 是过去分词,这里表示状态,be made of 由……材料制成
on business 是介词短语做表示原因的状语.因公外出.
at school shows 介词短语表示位置、处所、场合等,这里表示场合.

1.the bridge is built of stone.请问这个句子中的 built 是什么词性,是名词吗,怎么不英语：1.the bridge is built of stone.请问这个句子的语法,built 是动词吧,怎么就这样英语填空the stone bridge was built h_ of years ago. The old house is built ( ) stone The bridge is supposed to be built to be built是定语 the house built of stone lasts longer than___built of wood. The house built of stone lasts()the one built of wood. the bridge is in the _____(进程)of being built.the workers are 英语语法：The house built of stone lasts longer than ____ built o the building being built is our library这个句子对吗? the bridge,____________ built in 1959,is one of第一空填什么which w The new bridge is ___ the one built last year.