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从句是相当于主句而言的，由关联词引导，包含主语和谓语，不能单独成句，分为名词性从句（主语从句，表语从句，宾语从句及同位语从句），定语从句，状语从句
1、主语从句：用作主语的从句
1）it作形式主语：
it"s a good news that...
2) what引导的主语从句表示“什么东西”
what we lack is experience
3) what who when whether引导主语从句，用陈述语序
i did know why i felt like crying.
2、宾语从句
1）宾语从句可位于及物动词、介词和某些形容词后，连词that常可省略. in that(因为)，except that(除了)，but that(只是)
i promised that i would change this situation.
2）宾语从句后有宾补，要用形式宾语it 代替，宾语从句移至宾补之后
He has made it clear that he would not change his mind.
3、表语从句
结构“主系表”，that , what , when , why , whether , how ，because，as if(though)等引导，that常可省略
the reason why so many people died there is that there were not enough food suplies.
4、 同位语从句
同位语从句用于对前面出现的名词作进一步说明，一般用连词that 引导
the news came that their team had won the championship.
5、定语从句
引导定语从句的关系代词有who whom whose which that , whose 有时可以指物，相当于of which ,关系代词在从句中担任主语、宾语、定语等
限制性定语从句紧接先行词之后，若省区，原句意思不完整
those who live alone or who are sick may have trouble in getting close to other people.
1）先行词是all，anything，everything，something，nothing等不定代词，或者先行词有first，last,any,few,much,some,no,only以及形容词最高级修饰时，只能用关系代词that引导
that is all that i have heard from him.
2) 作宾语的关系代词常可省略
this is one of those things (which/that) we have to put up with.
3）关系副词when、where、why,关系副词在从句中作状语，相当于“介词+which”
非限制性定语从句，起补充说明，与主句之间用逗号隔开，若省去原句不受影响
as引导的定语从句代替先行词，引导非限制性定语从句，代替整个句子
As is mentioned above，no single company or group can control what happens on the internet.
6 状语从句
时间、地点、原因、结果、目的
1) 条件状语从句：if, unless ,as long as ,on condition that等
As long as you have the right equipment ,you can use a telephone line to transmit computer data.
2) 让步状语从句：though， although，even，whether等
Young as he is , he is quiet experienced in this work.
其中Young as he is = Though he is young. 含倒装，形容词（副词、动词、名词）+as + 主语+ 谓语
3）方式状语从句：as if, as though, just as.谓语动词常用虚拟语气，表示与事实相反
Everything went on as usual as if nothing had happened.
每日分享：Passion is a key ingredient to the study and practice of law and of life.
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