It is the book that I borrowed from the library yesterday .
There is a book that is very thick .
There is a book that is about maths .
这些都是定语从句,book是很少跟同位语从句的,只有news,fact,idea等之类可展示内含内容的名词才有同位语从句.这时的先行词与同位语从句就是等同的主表关系.The idea that we should go to another star and live there is interesting . The idea is that we should go to another star and live there .
It is the book .是判断句"这是一本.......的书."There is a book."是陈述句:"那里有一本书."就象"我有一本好书"与"那里放着一本书."的区别一样.
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