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

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英语：1.the bridge is built of stone.请问这个句子的语法,built 是动词吧,怎么就这样和is在一块了
2.i have trouble in learning English and i'm so worried could you help me with it 请问此句中 in learning English 能不能换成 on learning English
3.Suxy loves it and works hard on the subject.
4.Chinese is not easy for me ,but i like it very much ,i'm going work hard at it.请问3,4两题 works hard 后面的介词为什么不一样,一个是 on 一个是at?期待你的回答

is built是一般现在时的被动语态的谓语构成
　　have trouble/difficulty in doing sth.为固定用法,意思为“在－－－方面有困难”
　　work on/at 都有“致力于”的意思

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 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,怎么不英语填空the stone bridge was built h_ of years ago. 英语定于从句的题1.The place ( )the bridge is suppose to be built sho 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