分词和不定式位于句首的完全倒装 和 非谓语动词作主语 应该怎么区分？

Question

比如Buried in the sands was an ancient village.
To be carefully considered are the following question.这两句都是分词和不定式位语句首的完全倒装。
Learning English is such fun.
To have a walk after dinner is such fun.这两句又是分词作主语。
这两种情况应该如何区分？

Answer 1

动名词做主语：Playing video games is a waste of time. 玩电子游戏很浪费时间。

不定式做主语:To see is to believe.

分词不能做主语，可以做表语、
定语、状语、补语。

动名词相当于名词， 分词相当于形容词或副词。

分词和不定式可以做表语，在倒装句中放到句首。