句子结构（英语）陈述句、疑问句、祈使句、感叹句、状语从句、名词性从句、定语从句

1,陈述句：主谓宾是主要的,至于状语、补语等位置比较灵活；,
2,疑问句：疑问词（when,what,how等）+系动词（is,am,are）或助动词（do,does）+主谓
3,祈使句：一般祈使句的默认主语为you,所以一般是谓语+宾语的形式,
4,感叹句：疑问词+中心词（一般有两种形式,what+名词或者how加形容词）+主谓,
5,状语从句：从句整体做状语,说是从句,其实相当于一个副词
eg：put the book where it's put before
where it's put before 是一个状语从句,put the book 是祈使句成分已齐全,where it's put before只是一个地点状语而已,
6,名词性从句：整体相当于名词
eg：I don't know what you think
what you think相当于名词,
7,定语从句：整体相当于形容词；他与名词性从句区别
I don't know what you think改为定语从句（what you think在句中作谓语,）
I don't know the thing you think（I don't know the thing主谓宾齐全, you think是对the thing的修饰）