The headmaster saw the children playing on the playground同义句要说为什么哦.TO work in a school is very interesting.
问题描述：
The headmaster saw the children playing on the playground同义句
要说为什么哦.TO work in a school is very interesting.
答
The children were seen playing on the playground by the headmaster.主动句改成被动句意思一样.
It is very interesting to work in a school.将句子改成主语从句,意思一样.