题目内容：

I think it unnecessary to argue with him about it 为什么不能说I think it is necessary to...
I think it unnecessary to argue with him about it 为什么不能说I think it is unnecessary to argue with him about it.

优质解答

这两句在语法上都是对的
在意思表达上也是一样的
只是结构不一样
第一句是it 做形式宾语,unnecessary做宾语补足语 .不定式做真正宾语.
第二句是一个think 的宾语从句