名词性从句知识点总结
2021-11-23 22:15:27 来源：广州学而思爱智康整理 文章作者：广州学而思爱智康整理
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此篇是名词性从句知识点总结，小编多多整理了高中一些语句，希望能够帮助到各位同学。
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1.主语从句
That she was chosen made us very happy.
What caused the accident is a complete mystery.
“that”在主语从句中不作任何成分，但放在句首时不能省略。
有时为了使句子结构平衡，避免“头重脚轻”，常用it作形式主语，而把从句放在后面。
It depends on the climate whether they are going shopping today.
形式主语常用结构：
※It+ be +名词+ that从句
It is a pity that we won't be able to go to the south to spend our summer vacation.
※It+ be +形容词+ that从句
It is very likely that they will hold a meeting.
※It+动词的过去分词+ that从句
It is known to all that the gun powder was first invented by the Chinese.
注意：在表示建议、要求、命令等意义的被动结构中，that从句中的谓语动词常用(should) do(虚拟语气)。
It is suggested (requested, proposed, desired, etc.) that…
It is suggested that the work should be done with great care.
2.宾语从句
宾语从句在复合句中作主句的宾语，宾语从句一般放在动词、介词后。
She explained that she was late because of the heavy traffic.
有时要用it作形式宾语，而把宾语从句放在句子的后面。
He has made it clear that he will not give in.
宾语从句注意事项
使用虚拟语气的场合
(1)在表示要求、命令、建议、决定、坚持等意义的动词后，宾语从句常用“(should)+ 动词原形”。
I insist that she (should) do her work alone.
❤注意：suggest和insist有时不用虚拟
建议(虚拟)
suggest
暗示、表明、觉得(不虚拟)
E.g.：1. Her pale face suggested that she was(be)ill and I suggested she should go(go)to the hospital at once.
坚持要求(虚拟)
‚insist
坚持认为(不虚拟)
E.g.：The manager insists that he is (be)right and he insists that everyone should have(have)a new plan for the program.
(2)表示愿望的wish后的宾语从句中须用虚拟语气。
I wish I could fly. I wish I had known it before.
宾语从句谓语动词时态的选择
(1) 当主句为现在时或将来时,宾语从句为任意时态.
(2) 若从句是一个客观真理、科学原理、自然现象，从句用一般现在时。
The teacher said that the moon goes around the earth yesterday.
(3)当主句是过去时(could, would除外)，从句则要用相应的过去时态
①从句用一般过去时或过去进行时，表示与主句谓语动词动作同时发生
I only knew he was studying in a western country,but I didn’t know what country he was in.
He asked me if I was reading the story The Old Man and the Sea when he was in.
②从句过去完成时，表示该动作发生在主句谓语动作之前
He told me that he had told Mary about the meeting already.
③从句谓语用过去将来时，表示该动作发生在主句谓语动作之后
The reporter asked if the government would take necessary measures to put down the to-do.
3.表语从句
在句中作表语的从句叫表语从句。表语从句位于连系动词后，其基本结构为：主语 + 系动词 + 从句。
The problem is how we can get the things we need.
The scissors are not what I need.
注意事项：
(1)whether可以引导表语从句，但是if不可以。
(2)此外，as if/as though,because,why也可以引导表语从句。As if/as though引导表语从句时，根据从句的内容，有时需要使用虚拟语气。
It looked as if it was going to rain.
He looks as if he were an artist.
That’s because he didn’t work hard enough.
That was why I asked for three days’ leave.
需要注意的，当主语是reason时，表语从句要用that引导而不是because。
The reason why he was late was that he missed the train by one minute this morning.
4.同位语从句
同位语从句说明其前面的名词的具体内容。同位语从句通常由that引导，可用于同位语从句的名词有advice、demand、doubt、fact、hope、idea、information、message、news、order、problem、promise、question、request、suggestion、truth、wish、word等。
The news that we won the game is exciting.
I have no idea when he will come back home.
特殊疑问词也可以引导同位语从句，注意陈述语序。
My question how I shall get in touch with him has not been answered.
以上内容是名词性从句知识点总结。
