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】
有不会的可以再问我
不对，
改为：Outside the room was a boy eating an apple.
改得不对。
这个句子没办法改成倒装句。
A bus is coming 可以改成 Here comes a bus.
如果单纯想把这个句子的语法结构提高，可以用There be 句型
There is a boy eating an apple out side the room.
不对，就是Outside the room , the boy is eating an apple ,你那个句子把主语宾语放一起了，
outside the room ,a boy was eating an apple
Outside the room was a boy eating an apple
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