高一英语语法总结所有的从句形式包括定语从句,主语从句,状语从句,表语从句,同位语从句形式主语,形式宾语,独立主格,情态动

宾语从句分三种
①that引导宾语从句仅仅起引导作用,本身无具体意义,通常在非正式文体中可以省略,不引导介词的宾从（except that除外）
例子：She took it for granted that you knew the matter.
②whether获if 领导的宾从
这里的if从句不可以混淆于if引导的条件状语从句,不可以翻译成如果
Do you know whether/if any decision has been arrived at?
③连接代词和连接副词引导的宾从
连接代词有who whom whose what which;连接副词有when where how why等
I will tell you why I was late.
表语从句(标志单词：be动词）
①that引导表从不可以省略
The fact is that he didn't even take the exam.
②wh-疑问词引导的表语从句
That is why he was late for an hour.
③as if,as though,because,just as,引导的表从除because外后可以接虚拟语气
It looks as if we will be late.
主语从句
先行词通常是what
I don't know what he said.