名词性从句是英语语法中的一个重要部分，它在句子中充当名词的功能，可以作为主语、宾语、表语或同位语。为了帮助大家更好地理解和掌握这一知识点，以下将通过一系列练习题来巩固相关知识，并附上详细的答案解析。
练习题
一、选择题
1. The question is _______ we should go or stay.
A. that
B. whether
C. what
D. which
2. It is certain _______ he will come tomorrow.
A. if
B. when
C. that
D. where
3. I don’t know _______ he has already finished his homework.
A. whether
B. what
C. how
D. why
4. He told me _______ he would be back in two days.
A. when
B. that
C. where
D. who
5. The news _______ they won the game spread quickly.
A. that
B. which
C. what
D. whose
二、填空题
6. I don’t know _______ to do next.
7. _______ he said made me very angry.
8. It’s not clear _______ the meeting will last.
9. The problem is _______ we can solve it in time.
10. _______ you did was unexpected.
答案解析
1. B. “whether”表示“是否”，用于引导主语从句，强调选择关系。
2. C. “that”引导主语从句，表示确定的事实。
3. A. “whether”用于引导宾语从句，表示“是否”的疑问。
4. B. “that”引导宾语从句，无实际意义，只起连接作用。
5. A. “that”引导同位语从句，解释说明“news”的具体内容。
6. what. 填入“what”表示“做什么”。
7. What. 填入“What”引导主语从句，表示“他说的内容”。
8. how long. 填入“how long”表示“会议持续多久”。
9. whether. 填入“whether”引导表语从句，表示“我们能否及时解决”。
10. What. 填入“What”引导主语从句，表示“你所做的”。
以上练习题涵盖了名词性从句的主要类型和用法，希望对大家的学习有所帮助！通过反复练习，能够更加熟练地掌握名词性从句的相关规则。
