例如:I cleaned the classroom.我打扫了教室
可以根据汉语意思来理解改成被动语态就是“教室被我打扫了”
因此,可以得到The classroom was cleaned by me.教室被我打扫了
根据汉语意思来改会比较容易.
JOY broke the window.
乔打碎了玻璃
The window was broken by JOY.
玻璃被乔打碎了