【关于名词性从句专项训练题与答案】在英语语法的学习过程中，名词性从句是一个非常重要的知识点。它不仅在语法结构中占据重要地位，而且在实际的写作和阅读理解中也频繁出现。掌握好名词性从句，有助于提高语言表达的准确性和逻辑性。
名词性从句是指在句子中充当主语、宾语、表语或同位语的从句。常见的名词性从句包括：主语从句、宾语从句、表语从句和同位语从句。这些从句通常由连接词（如that, whether, if, what, who, when, where, why, how等）引导，其结构相对固定，但使用时需要注意语序和时态的搭配。
为了帮助学习者更好地理解和运用名词性从句，以下是一些精选的专项训练题及参考答案，旨在通过练习加深对这一语法点的理解。
一、选择题
1. I don’t know ______ he will come tomorrow.
A. that
B. if
C. whether
D. what
答案：B / C
（注：在正式语境中，“whether”更常用；口语中也可用“if”。）
2. The teacher asked ______ we had finished our homework.
A. that
B. if
C. whether
D. what
答案：A
（因为从句是陈述语气，不需疑问词引导。）
3. She said ______ she would go to the party.
A. that
B. if
C. whether
D. what
答案：A
（主句为过去时，从句应保持陈述语序。）
4. Do you know ______ the meeting starts?
A. when
B. that
C. if
D. whether
答案：A
5. The problem is ______ we should take action now.
A. that
B. if
C. whether
D. what
答案：A
（表语从句中使用“that”引导，表示事实。）
二、填空题
1. I wonder ______ he is coming.
答案：if / whether
2. They discussed ______ they should go to the beach or stay at home.
答案：whether
3. The question is ______ we can finish the project on time.
答案：whether
4. He told me ______ he had passed the exam.
答案：that
5. She asked me ______ I wanted to eat.
答案：what
三、改错题
1. I don’t know that he is not coming.
错误分析：当主句为否定时，一般不用“that”，而用“whether”或“if”。
正确句子：I don’t know whether he is not coming.
2. The fact is that he didn’t tell the truth.
错误分析：该句结构正确，无需修改。
正确句子：The fact is that he didn’t tell the truth.
3. Do you know if she is here?
错误分析：虽然语法上可以接受，但在正式场合中更推荐使用“whether”。
正确句子：Do you know whether she is here?
4. He asked me what I think about the movie.
错误分析：从句应使用陈述语序。
正确句子：He asked me what I thought about the movie.
5. The reason is because he was late.
错误分析：“because”不能直接引导表语从句，应使用“that”。
正确句子：The reason is that he was late.
四、翻译题
1. 他告诉我他明天会来。
翻译：He told me that he would come tomorrow.
2. 我们不知道他是否会参加聚会。
翻译：We don’t know whether he will join the party.
3. 这个问题是他们是否应该采取行动。
翻译：The question is whether they should take action.
4. 她说她已经完成了作业。
翻译：She said that she had finished her homework.
5. 你认为他会赢得比赛吗？
翻译：Do you think whether he will win the competition?
通过以上练习题，学习者可以逐步掌握名词性从句的基本结构和使用方法。在实际应用中，注意从句的引导词、语序以及主句和从句之间的逻辑关系，才能更准确地运用这一语法现象。建议多做类似练习，并结合真实语境进行理解，以达到熟练掌握的目的。
