英语写作中的从句之一：名词性从句
1. 常见名词性从句的分类：That the earth is round is a fact. (从句作主语—主语从句)
I don’t know if he needs my help. (从句作宾语—宾语从句)
The point is whose book is the most interesting.(从句在be 动词后—表语从句)
I have no idea who he is. (从句做同位语—同位语从句)
注：同位语从句前面的名词多为fact, reason, idea, problem, question, conclusion等抽象名词。
2. 使用主语从句注意主谓一致问题
1) 单个名词性从句做主语时，其后的动词通常用单数。
2) 两个由and 连接的并列名词性分句作主语，如果主语表示两件事情，动词用复数。
What caused the accident and who was responsible for it remain a mystery to
us.
3) 在以what-分句作主语结构中，如果be 动词后面是复数名词，谓语动词用复数形式。
What caused the accident is a complete mystery.
What was real to him were the details of his life.
4) 如果what-分句本身明显表示复数意义，谓语动词用复数。
What are often known as best-seller books are not really interesting for
everyone.
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