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it was in china where we met 这是什么句型
定语从句。先行词是china，后面的是修饰限定china所以是定语从句。
这句话，it是形式主语，真正的主语是where we met
也就是这句话是：where we met was in china
强调句句型有两种，一种是it is that强调事
一种是it is who强调人的
强调句最大的特点，去掉it is that或who，句子仍然完整。
表语从句
表语从句
一 定义：
A 表语从句就是用一个句子作为表语。
The problem is puzzling.
主语 连系动词 形容词作表语
The problem is when we can get a pay rise.
主语 连系动词 一个句子作表语---表语从句
B 连接表语从句的连接词有：that, what, who, when, where, which, why,
whether,how.
He has become a teacher.
He has become what he wanted to be ten years ago.
She has remained there for an hour.
She has remained where I stood yesterday for an hour.
His suggestion is good.
His suggestion is that we should stay calm.
The question is confusing.
The question is when he can arrive at the hotel.
who will travel with me to Beijing tomorrow.
why he cried yesterday.
how I can persuade her to join us in the party.
whether the enemy is marching towards us.
二 注意：
A 表语从句一定要用陈述语序。
False: The question is when can he arrive at the hotel.
Right: The question is when he can arrive at the hotel.
B 不可以用if，而用whether 连接表语从句(as if 例外）。
False: The question is if the enemy is marching towards us.
Right: The question is whether the enemy is marching towards us.
Right: It looked as if he had understood this question.
C 不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。
Right: The question is who will travel with me to Beijing tomorrow.
Right: The question is why he cried yesterday.
D that在表语从句中不可以省掉。
表语从句只能置于主句之后，而主句的动词只能是联系动词。
表语从句的结构
表语从句的结构如为："主语+连系动词+表语从句"
从句在主从复合句中作表语，则称之为表语从句。表语主要用于修饰主语，构成主系表结构，删除后句子结构意义皆不完整。延伸为表语从句时，也是用于修饰主语，不可删去。注意表语从句的语序为陈述语序。
拓展内容：
1、The boy talked you just now is my classmate. (名词充当表语)
2、I didn’t know that it was you at that time. (代词充当表语)
3、The window remained closed. (动词-ed充当表语)
4、 My mother’s daily job is cleaning the house. (动词-ing充当表语)
5、The house is not only clean but also beautiful. (形容词充当表语)
表语从句的用法归纳总结
表语(predicative)它是放在连系动词之后表示主语的身分或特征的，如I am a student(我是一个学生)中的student；Our classroom is clean(我们的教室很干净)中的clean
表语：名词、代词和形容词
His father is a doctor.他父亲是个医生。(名词doctor作表语
句(clause)内含主语部分和谓语部分，表达一定的概念，但不成为一个独立句子的一组词，叫做从句。从句在句子里可以作为一个句子成分，一般由连词、关
系代词或关系副词所引导。
从句在句中可用作主语、表语、宾语、定语、状语等句子成分；
a)主语从句(subject clause)如What I want to say is this(我要说的是这么一点)中的what I want to say。
b)表语从句(predicative clause)如This is what I want to say(这是我要说的)中的what I want to say。
c)宾语从句(object clause)如I have said what I want to say(我说完了我要说的话)中的what I want to say。
d)定语从句(attributive clause)如This is the thing I want to say(这就是我要说的)中的I want to say。
状语从句(adverbial clause)如If you want to say something，say it clearly(假如你要说什么，就应说清楚)中的if you want to say something。
句子(sentence)内含主语部分和谓语部分，有比较完整的意义的一组词，叫做句子。
表语的位置 在连系动词之后。如：
It's fine today.今天天气很好。
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