Hidden amongst the skyscrapers are remains of original Shanghai.
请问老师，Hidden amongst the skyscrapers 为何能做主语？
Hidden amongst the skyscrapers are remains of original Shanghai.
句中的 Hidden amongst the skyscrapers 不是主语，其实这是倒装句，不倒装的语序为：
Remains of original Shanghaiare hidden amongst the skyscrapers.
类似的使用方法如：
Hidden among the roots of the trees are wild narcissi.=Wild narcissihidden among the roots of the trees. 野水仙隐藏在树根之间。
Hidden among the trees is his old house, which was build 50 years ago.=His house, which was built 50 years ago, is hidden among the trees. 隐藏在树丛的是他那50年前建的老宅。
