FEMALE PROFESSOR:But as I said, fresco means fresh, and thats because to create a fresco, the paint has to be applied very soon after the plasters been spread over a surface, right onto the wet, fresh plaster.
FEMALE PROFESSOR:By doing this, the painting actually becomes part of the plaster.Finishing a painting before the plaster dry(or dried 不确定） was a real challenge for fresco painters.
请问，老师这句话的主语是什么？ 我的理解是 before 是conj, dry是不及物动词，Finishing a painting before the plaster dry 这种一个名词+一个句子一块做主语
网友应该注意一个定义：动名词虽然能作名词性的成分比如主语、宾语等，但动名词本身还是动词，可以有宾语，被副词修饰。一个动名词带有状语从句也是非常自然的事。所以，下面这个句子中，作主语的并非网友觉得的“一个名词+从句”，而是动名词短语作主语。
Finishing a painting before the plaster dried was a real challenge for fresco painters.
你的疑惑产生是什么原因，是你混淆了动名词和名词有什么区别，忽视了动名词本身是个动词（非限定动词）这个现实。
