这个是表语从句吗 其结构是什么

Question

这个是表语从句吗 其结构是什么it appears that good manners in America are not good manners in Japan

Answer 1

你这个句子是典型的表语从句：It（主语） appears（系动词） that good manners in America are not good manners in Japan（从句担当表语成分）,这个是典型的主系表结构.
但如果我变一下你这个例句.：It appears certain that good manners in America are not good manners in Japan.我在连接动词后加了个certain,这个就是主语从句了.这个句子的真正语序是：That good manners in America are not good manners in Japan appears certain.看到了吧,从句在复合句中担当的成分是主语而不是表语.
所以,以后看到it开头的句子,千万不要就主观的认为它一定是主语从句还是表语从句,也不要根据连接动词是不是系动词去判断,这些都不是我们判断的标准,真正的判断的标准就是对句子结构进行分析,从而分清从句在复合句中所担当成分.追问

你是复制的

😒

追答

哈哈，是的百度的

Answer 2

这是主语从句，it做形式主语追问

怎么区别的呢

有人说 动词后和 that之间没有词就是表语

追答

我搞错了，你说的这句话确实是表语从句。

表语从句（predicative clause）放在连系动词后，充当复合句中的表语，一般结构是“主语+连系动词+表语从句”。可以接表语从句的连系动词有be，look，remain，seem等。引导表语从句的that常可省略。另外，还有常用的“the reason ... that”和“it/this/that is because ...”结构。例如：
It seems that/as if it is going to snow . 看起来天要下雪了。
This is how Jane lives . 简就是这样生活的。
That is why Jack got scolded . 这就是杰克受训斥的原因。
That's where the river joins the sea . 那就是河流入海的地方。
Home is where you can find love and care . 家是你能够得到爱和关怀的地方。
Tomorrow is when it would be most convenient . 明天是最合适的时间。
Home is where the heart is . 家是心神向往的地方。
The reason he did not come is that he was ill. 他没来的原因是他病了。
It may be because he didn't sleep well last night . 也许是因为他昨天夜里没有睡好。
The question remains whether we can win the majority of the people . 问题是我们能否赢得大多数人民群众的支持。
You must be what the public thinks you are, not what you really are or could be . 你必须成为大众意想中的你，而不是那个真实的你或者可能实现的你。
The reason why/that he was dismissed is that he was careless and irresponsible . 他被开除的原因是工作马虎，不负责任。
The point is that you should have told me where you were mistaken . 最重要的是你本应告诉我你错在哪里。
I need something official to prove you are who you say you are . 我要的是某种能证实你说的身份的官方证件。

追问

额 主语从句也有it+不及物+从句

追答

amount of public sympathy? 为什么她的案子得到了无数公众的同情？
How amazing it is that the 70-year-old man should have swum across the channel! 这位70岁的老人竟然游过了海峡，真是令人惊奇！
How amusing it is that the magician conjured a rabbit out of his hat! 魔术师从帽子里变出一只兔子，真逗人！
② 在It dawned on sb. that 结构中，that引导的从句只能后置。例如：
It dawned on her that he had been right all along . 她突然意识到他一直都是对的。
③ 比较：
他所需要的是更多的经验。
What he needs is more experience. ［√］
It is more experience what he needs. ［×］
据估计，飞到火星来回的时间要超过一年。
That a round-trip to Mars would take more than a year is estimated. ［√］
It is estimated that a round-trip to Mars would take more than a year. ［√］
她是否要扮演这个角色值得怀疑。
Whether she would play the part is still doubtful. ［√］
It is still doubtful whether she would play the part. ［√］
犯人是如何逃跑的是个谜。
How the prisoner escaped is a mystery. ［√］
It is a mystery how the prisoner escaped. ［√］
④ because偶尔可以引导主语从句。
2. it作形式主语和it引导强调句的比较
it作形式主语代替主语从句，主要是为了平衡句子结构（特别是谓语较短时），主语从句的连接词没有变化。而it引导的强调句则是对某一句子成分的强调（这一成分可以是词、词组或句子），其结构是“It be+that”。无论强调的是什么成分，都通用连接词that，强调人时也可用who/whom/whose，强调地点时也可用where,强调时间时也可用when。参阅有关章节。比较：
It was ordered that the goods be sent there by plane.根据命令，那些货物必须空运到那里。（it 作形式主语）
It was last summer that he graduated from the university. 他是去年夏天从那所大学毕业的。（it be that 为强调句型）
It has been found out who set the record. 已经弄清楚纪录是谁创造的。（it 作形式主语）
It was Mary that/who set the record. 是玛丽创造了纪录。（it be that 为强调句型）

4. 主语从句不可位于句首的几种情况
除了if引导的主语从句不可居复合句的句首外，在下列情况下，主语从句亦不可提前。
(1)It doesn't matter+how/ whether ...结构中的主语从句不可提前
他喜不喜欢它都没关系。
It doesn't matter whether he likes it or not . ［√］
Whether he likes it or not doesn't matter. ［×］
(2)It is said/ reported ...结构中的主语从句不可提前
据说这条高速公路明年通车。
It is said that the expressway will be open to traffic next year . ［√］
That the expressway will be open to traffic next year is said. ［×］
(3)含主语从句的复合句是疑问句时，主语从句不可提前
下午可能会下雪吗？
Is it likely that it will snow in the afternoon ？［√］
Is that it will snow in the afternoon likely？［×］
【提示】 在简短句子中，主语从句的引导词that可以省略。例如：
It's a good thing George can't hear us. 乔治听不见我们讲话是个好事。
It's a pity you can't swim. 你不会游泳，真遗憾。
It seems likely someone left the door unlocked. 似乎有人可能忘了锁门就出去了。

追问

没有啊

并没有我说的这个句

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