一般过去时被动语态

was done
were done
例如：A man was killed.
The boys were praised by their teacher.

．一般现在时（am/ is/ are +done）
English is spoken by lots of people in the world. 世界上的许多人都说英语。
Class meeting is held every Thursday. 每周四都举行班会。
The classroom is cleaned by the students every day. 学生们每天都打扫教室