Question

I've written words that I never knew were in the world这句话的句子

Answer 1

I've written words (that I never knew were in the world).主谓宾结构.

I've written words是本句的主要部分,主语I,谓语 have written,宾语 words.

that (I never knew) were in the world是定语从句.其中I never knew是插入语,在不在都不影响句子语法结构,只会对意思有影响.