请教一个英语倒装句,a boy is eating an apple outside the room

题目

请教一个英语倒装句,a boy is eating an apple outside the room
我想改成倒装句,outside the room was eating an apple a boy
请问这个倒装改的对吗?应该怎么改?
【副词或地点状语+助动词+主语+谓语+宾语】
这个。难道was 是算助动词？到底倒装的谓语动词算哪个？was eating?还是只是eating?

答案

应该是
outside the room was a boy eating an apple
副词或地点状语放句首,倒装的结构是
【副词或地点状语+助动词+主语+谓语+宾语】