定语从句的先行词能不能用it?如 it which.

通常是：
he who -- -
those who -- - -
everything that
all that
the book that / which
the dog that / which bites should be kept under control.
你的 it which 极少见-----应该是it that 例句： it that we all want is work.(是定语从句)。It is work that we all want.(是强调句结构)。
强调句结构：It is / was - - - -- that-- -- - .

从理论上讲,定语从句的先行词可以由名词或代词来充当 ,那么it作为代词之一是可以做先行词的.
但是,查询了一下,发现一般情况下,用做先行词的代词都是HE.或者those
He who laughs last laughs best.
谁笑到最后,谁笑得最好.
He who cannot reach the Great Wall is not
a true man.
不到长城非好汉.
God helps those who help themselves.
天助自助者.
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