which one 引导的特殊疑问句 There are three reasons，which one is the cause that makes you unhappy？Which one makes you unhappy？从这两个句子可以看出后面那一句只是省略了\"that\"，因为which one已经是一个疑问词了，所以后续的从句一般都用不上what，where，of which，when.
一般疑问句和特殊疑问句的SSA（主谓宾等的划分） 同学 看来你的英语语法很有问题.就按例句来说请先把他们假设改成陈述句1.What are you doing？You are playing the piano.2.What is the capital of China？Beijing is the capital of China.3.What does it look like？it is big and long.显然第一句 what=the piano作宾语 动词后面是宾语第二句 what=Beijing 做主语第三句what=big and long做表语 系（动词）表（语）结构另外when作状语 which可作主语或宾语，why作宾语，how意思较多，视情况而定同学牢记语法要学得扎实 踏实 之后才能有飞跃 加油
which one 引导的特殊疑问句关系代词语法上一定要用that引导吗 1）what=the thing which；whatever=anythingWhat you want has been sent here.Whatever you want makes no difference to me.2)who=the person that whoever=anyone who（错）Who breaks the law will be punished.（错）Whoever robbed the bank is not clear.（对）Whoever breaks the law will be punished.（对）Who robbed the bank is not clear.3)that 和 what当that引导定语从句时，通常用作关系代词，而引导名词性从句时，是个不充当任何成分的连接词。宾语从句和表语从句中的that常可省略。What只能引导名词性从 句，用作连接代词，作从句的具体成分，且不能省略。I think(that)you will like the stamps.What we need is practice.1）不用that的情况a)在引导非限定性定语从句时。(错)The tree，that is four hundred years old，is very famous here.b)介词后不能用。We depend on the land from which we get our food.We depend on the land that/which we get our food from.2)只能用that作为定语从句的关系代词的情况a)在there be 句型中，只用that，不用which。b)在不定代词，如：anything，nothing，the one，all，much，few，any，。
