只说what从句做主语的情况(表语是复数):
结论:单数、复数都对. 但到目前,用单数的还是普通一些:
说用复数可以,属于“翻转派”,即:
What was real to him were the details of his life.
----> the details of his life were what was real to him.
好像是很有道理,但反对的人认为,这样实际是改变了原始结构,不算。
所以用单数还是复数,这就看个人的偏好了。
从句作主语,谓语用单数这条规则是不适用于名词性关系分句的。
名词性关系分句(融合型关系代词引导的从句)相当于一个名词词组。如果表语为复数名词,通常系词用复数形式(即系词的数由表语名词的数决定)。
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葛传槼编著的《英语惯用法词典》认为下面两个句子都可以说,但是第一句比第二句好:
What is required is some good books.
What are required are some good books.