关于主语从句what的问题,求解惑
第二张句子没有问题,原则上都是按这个走,但what引导的主语从句有特殊,所以 第一张是第二张的补充。
第一张的最后一句话 what they makes in this factory are TV sets .
订: what they make ... are TV sets. make用什么形式它的主语they决定。
1.what引导的名词性从句中从句谓语动词的单复数情况:
what后面“什么时候用单数,什么时候用复数”根据动词后面的名词的单复数来定.
2.what引导的名词性从句做主语时,主句谓语动词的单复数情况:
(1)What在从句中做主语,主句谓语由what从句的谓语决定。
What is difficult to understand is A.
What are difficult to understand are A and B.
(2)what在从句中做宾语,主句谓语由主句表语/宾语决定what they want are XX,XX&XX。
What his father left him are a few English books.
也就是说,what引导主语从句,主句的主谓一致,不一定要用is,而是what后面用啥主句就用啥: what is... is... /what are...are...
而what从句中的主谓一致,位于的单复数则需要根据主句动词后面名词单复数来决定
所以,结合以上两点才会有 What are difficult to understand are A and B
在第二条规则里的后两个例子中,what they want are A, B, and C. what his father left him are ...books. 个人感觉应该是倒装,把宾语提前了