Adding old black and white pictures and contrasting them with new ones is a nice thing to do.这句也是主系表对吧~那主语是什么结构的?to do是修饰吗?

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Addingoldblackandwhitepicturesandcontrastingthemwithnewonesisanicethingtodo.这句也是主系表对吧~那主语是什么结构的?todo

Adding old black and white pictures and contrasting them with new ones is a nice thing to do.这句也是主系表对吧~那主语是什么结构的?to do是修饰吗?
Adding old black and white pictures and contrasting them with new ones is a nice thing to do.
这句也是主系表对吧~那主语是什么结构的?to do是修饰吗?

Adding old black and white pictures and contrasting them with new ones is a nice thing to do.这句也是主系表对吧~那主语是什么结构的?to do是修饰吗?
这句话的主语是Adding old black and white pictures and contrasting them with new ones ,主语是由and连接的并列结构,to do是定语,修饰thing,表示一种将来的状态,比如Learning
English is an essential thing to do.而Adding和 contrasting就是动名词,因为动词原形不能直接作主语,得转换成动词ing形式或者to do 形式,

Adding old black and white pictures and contrasting them with new ones 是这个句子的主语
属于动名词短语...
有点长 呵呵..
adding 和contrasting是动名词作主语,用and连接,,是并列的关系...
后面的to do 是用来修饰thing,,是动词不定时作定语的形式...

主语:Adding old black and white pictures and contrasting them with new ones (分词短语)
is a nice thing是系表结构作谓语
to do是定语,修饰thing