句型转换可以删掉主语吗?

题目

句型转换可以删掉主语吗?
例子,根据A句完成B句,保持句意不变.
A：They are going to pull down the old houses.
B：The old houses are going to be pulled down.
B句中的They没有了,这样可以吗?

答案

可以.因为改成被动语态后,主语已经变成"The old houses",而 They 不做主语.若 执行动作的人在句中并不重要,可省略.完整的句子是：The old houses are going to be pulled down （by them.）从上可看出,they在被动语...