We will have to send for a doctor.
我们需要去请一个医生
A doctor will have to be sent for by us.
Someone left the light on all night.
某人让这灯整夜没关
The light was left on by some one all night.
语法:被动语态 sth.be done +by sb.+其他(时间等)
2.改错句
The work is sure being finished on time.
The work is sure to be finished on time .
这任务已经确定在规定时间内完成了.