Question

I think it's absolutely necessary for children to read book从语法角度看，有问题吗？

Answer 1

I think it's absolutely necessary for children to read book
从语法角度看，有问题吗？
这是一个宾语从句，完整表述如下：
I think （that） it's absolutely necessary for children to read book。
主句是：I think （that），用一般时态
从句是：it's absolutely necessary for children to read book。用一般时态it是形式主语，to read book是真正主语。
整个句子的主从句使用和时态搭配都是可以接受的。

追问

I think it's absolutely necessary for children to read book与
I think it absolutely necessary for children to read books.两个句子， 哪一个正确？如何解释？

追答

read books.是正确表述，意思是阅读书籍。

book做单数形式，前边要加冠词a/the.