承受者 + be (is/am/are) + done(过去分词)+ by + 执行者。
eg. Many schools are built(done)every year in the city.
注意：地点状语，时间状语一般都放在句末;in the city 特指。
A lot of修饰可数和不可数名词
主动：They all read(原形)English every day.
被动：English read (过去分词)by all of them every day.
主动：Mother often scolds me.
被动：I am often scolded by mother.
承受者 + be (was/were) + done(过去分词)+ by + 执行者(不明确时可省略)。
eg. 主动：He repaired his bike yesterday.
被动：His bike was repaired by him yesterday.
主动：Children cleaned many streets last Sunday.
被动：Many streets were cleaned by children last Sunday.
承受者 + be (is/am/are) + being(现在分词)+ done + by + 执行者(不明确时可省略)。
eg. 主动：He is writing his composition.
被动：His composition is being written by him.
注意：write – wrote - written
承受者 + be (was/were) + being(现在分词)+ done + by + 执行者(不明确时可省略)。
eg. 主动：He was majoring computer during his college.
被动：Computer was being majored by him during his college.
承受者 + be going to/will (shall) be动词原形/be to be done + by + 执行者(不明确时可省略)。
eg.1 A big supermarket will/shall/be to be built here next year
eg.2 The flight is to leave for Hefei city.
承受者 + have(复数主语)/has been done + by + 执行者(不明确时可省略)。
eg. 主动：Our School has finished many scientific researches.
被动：Many scientific researches have been finished by our school.
承受者 + (be going to/will/shall/be to) + have been done + by + 执行者。
eg. 主动：We'll have finished the book by the end of September.
被动：The book will/shall have been finished by the end of September.
注意：by the end of 短语的用法
(1)Will have done by the end of + 将来时态
(2)Had done by the end of + 过去完成时态
eg. The project had been made by the end of last week.