Attached is my composition.这是什么语法?

1 结构与 Here is my composition 一样.
2 是全倒装结构.记住,方位词提前的结构属于全倒装.你的句子可以这样理解（比如说）：
My composition is attached ( to this letter).I spent five hours writing the composition the night before.变成倒装句就是：
Attached( to this letter) is my composition,which I spent five hours writing the night before.
还有：
An English girl is seated / sitting next to my brother.She has just arrived from London.He got to know her 5 years ago.
-------- Seated / sitting next to my brother is an English girl,who has just arrived from London and whom he got to know 5 years ago.方位词不应该是on above in 这些吗？过去分词也算方位词吗？我句子中的括号部分，你看见了吗？在你的句中被省略了。方位词提前的结构：She comes in -------in she comes. (副词)She comes into the room --------- into the room comes the girl with her boyfriend（介词短语）Coming into the room is the girl, who comes from Tokyo, Japan. ------分词+介词短语------成了不可分割的有效短语。