当are to在句首的时候

经过自己的思考，应该是一种倒装/主语后置的应用。

比如我在THE CROWD中读到这样一句话：

In this way are to be explained erroneous recognitions of the dead bodies of children by their own mother.

原来的语序应该是这样的：

In this way erroneous recognitions of the dead bodies of children by their own mother are to be explained.

记得以前老师提过当主语过长时可以将其放到句尾，这种用法还可以用来表示强调谓语或者表语。