名词性从句是指在复合句中起名词作用的句子名词性从句在复合句中能作主语、宾语、表语、同位语等，因此根据它在句中不同的语法功能，名词性从句可分为主语从句、宾语从句、表语从句和同位语从句，我来为大家科普一下关于名词性从句讲解方法?以下内容希望对你有帮助!
名词性从句讲解方法
名词性从句是指在复合句中起名词作用的句子。名词性从句在复合句中能作主语、宾语、表语、同位语等，因此根据它在句中不同的语法功能，名词性从句可分为主语从句、宾语从句、表语从句和同位语从句。
★ 主语从句 ★定义
在复合句中作主语的句子称为主语从句。
常见的连接词
that, whether, who, what, Whatever, whoever, where, when, why, how等。
用法
(1)如果表示一般情况，主句的谓语动词通常用第三人称单数，且主语从句本身的时态不受主句时态的影响。
(2)为了避免句子头重脚轻，通常把形式主语it放在句首，真正主语放在句末。一般常用句型为：
①It is n. that从句。
②It is adj. that从句。
③It is 过去分词 that从句。
④It turned out that ...
⑤It hit sb. /occurred to sb. that ...
其他
(1)从句的意思完整时用that引导，that在从句中没有意义且不能省略。
(2)引导置于句首的主语从句时，只能用whether，不能用if。
(3)what, whatever, whoever引导主语从句时，既可在从句中作主语也可作宾语，what还可在从句作表语。
★ 宾语从句 ★定义
在复合句中，由一个句子作宾语，这个句子就叫作宾语从句。
常见的连接词
that, whether, if, who, whose, which, when, how, what, why等。
用法
(1) that引导的宾语从句。
①及物动词后的连接词that可省略。 ②that除了在介词in, except, but, besides后构成固定用法外，不可在其他介词后引导宾语从句。 ③如果宾语后有补足语，要用形式宾语it来代替，而将从句放到补足语的后面去。 ④当一个动词后有两个或两个以上宾语从句时，第一个that可省略，第二个以及其他的that不可以省略。
【注】 有些像appreciate, like, dislike, love, hate等表示“喜欢，爱，恨”等心理方面的动词，其后加上it作形式宾语，再接if/wh-从句作真正的宾语。
(2)whether与if引导宾语从句。
whether与if引导的宾语从句，有“是否”的含义，常用在ask, wonder等动词之后，二者可以互换。
【注】只能用whether，不能用if的情况：
◆在介词后面。
◆在动词不定式前。
◆当后面直接跟or not时。
(3)宾语从句的语序要用陈述句语序。
在含宾语从句的复合句中，不管主句是陈述句还是疑问句，从句一律是用“连接词＋陈述句语序”，其标点符号由主句来决定。
(4)时态一致性。
①若主句时态是现在时态，宾语从句的时态可根据实际情况而定。 ②若主句是过去时态，宾语从句的时态通常也用过去时态。
★ 表语从句 ★定义
在复合句中，由一个句子作表语，这个句子就叫作表语从句。
常见连接词
that, whether, as though/as if, because, who, what, which, whom, whose, whatever, whoever, when, where, why, how, however, whenever, wherever等。
用法
(1)可以接在be, look, remain, seem等连系动词后面。
(2)表语从句用陈述语序。
(3)This is because ...意为“这是因为……”，指原因或理由；This is why ...意为“这就是为什么……；因此……”，指由于各种原因所造成的后果。
其他
(1) that在表语从句中通常不可省略。
(2)引导表语从句时，用whether，不用if。
★ 同位语从句 ★定义
在复合句中充当同位语的句子。同位语从句用来对其前面的抽象名词进行解释说明，被解释说明的词和同位语在逻辑上是主表关系。
常见连接词
that, whether, what, who, how, when, where等。
用法
(1)that引导的同位语从句：
①that引导同位语从句时，从句为一个句意完整的陈述句。 ②that在从句中不充当句子成分，没有具体的意思，只起连接作用，但不能省略。
(2)whether引导同位语从句时不能与if互换。
(3)有时同位语从句可以不紧跟在它所说明的名词后，而被别的词语隔开。
★ 目标训练 ★将下列句子转换为名词性从句，每空一词。
1. Foreigners seem increasingly interested in learning Chinese culture.
→ foreigners are increasingly interested in learning Chinese culture.
2. Cherry told me the computer games had affected her son.
→ Cherry told me the computer games had affected her son.
3. The factory in our town will have to close. What a shock to us all!
→ is a shock to us all the factory in our town will have to close.
4. Peter felt upset because he failed the test yesterday.
→ Peter failed the test yesterday. he felt upset.
→ The reason why Peter felt upset was he failed the test yesterday.
5. Joe suggested that we should have a further discussion about the final decision, which sounded very important.
→ Joe’s suggestion we should have a further discussion about the final decision sounded very
important.
6. No one is allowed to copy or use it without permission, but Carl broke the rule.
→ Carl broke the no one is allowed to copy or use it without permission.
7. “Did your father’s bad attitude make you unhappy?” I asked her.
→ I asked her her father’s bad attitude her unhappy.
8. Do you know why your sister is so sad these days?
→ Do you know makes your sister so sad these days?
9. Helping people in trouble to get out of their sufferings is our duty.
→ people in trouble to get out of their sufferings.
10. When we shall have our meeting is still a question.
→ we shall have our meeting.
11. His invention has greatly changed the way people communicate with each other.
→ has greatly changed the way people communicate with each other.
12. Obviously, without the help of the whole society, there would be no new school buildings.
→ without the help of the whole society, there would be no new school buildings.
key：
1. It seems that
2. What; is that
3. It; that
4. That is why; that
5. that
6. rule that
7. whether; had made
8. what
9. What’s our duty is helping
10. It is still a question when
11. What he invented
12. It is obvious that
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