常见题型：语法填空、翻译题、选择题
名词性从句是在句中充当名词作用的从句，可作主语、宾语、表语和同位语。连接词分为三类：从属连词(that无实义/whether是否/if是否)仅连接不作成分；连接代词(what/who/which等)既连接又作成分；连接副词(when/where/why/how)既连接又作状语。
一、主语从句：
What surprised us most was his attitude. 最让我们惊讶的是他的态度。(what在从句中作主语)
That he passed the exam is a great relief. 他通过了考试让人大松一口气。(that无实义不作成分)
Whether we will go depends on the weather. 我们是否去取决于天气。(whether表"是否"，不用if)
二、宾语从句(三类)：
① 动词宾语: I believe that hard work pays off. 我相信努力会有回报。
② 介词宾语: We are talking about whether we should hold a meeting. 我们在讨论是否要开会。(介词后只用whether不用if)
③ 形容词宾语: I am afraid that I can't attend the ceremony. 我恐怕不能参加典礼了。
三、表语从句(系动词后):
The problem is whether we can meet the deadline. 问题是我们能否赶上截止日期。(系动词后用whether不用if)
The reason is that he didn't prepare well. 原因是他没有充分准备。(reason的表语从句必须用that)
四、同位语从句(跟在抽象名词后解释其内容):
常见的先行词: fact/idea/news/truth/belief/doubt/suggestion/promise/hope 等
The news that our team won the championship spread quickly. 我们队夺冠的消息很快传开了。
I have no idea where he has gone. 我不知道他去了哪里。
⚠️ 关键辨析: what vs that
What he said was not true. 他说的话不是真的。(what=the thing that, 在从句中作said的宾语)
That he said something is not important. 他说了什么不重要。(that无实义，从句完整)
⚠️ 陈述语序: 名词性从句必须用陈述语序(主语+谓语)
Can you tell me where the station is? 你能告诉我车站在哪里吗？(不是where is the station)
语法填空1-2题 + 翻译题0-1题, 占语法总分约15%