所谓非谓语动词形式开头，其实就是指动词的独立或复合结构作句子的主语，形式多样且繁杂。
如谚语：Saying is believing. 如果你认为这是动名词不算，那就接着来啥：
To reply your question is my pleasure.
Seeing light on your question is of vital importance for me to response.
Obtained your acknowledgement will make me very happy.
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