Question

I'm+not+sure+I+agree+with+you运用了什么？

Answer 1

您好，I'm not sure I agree with you. 运用了省略（that）的宾语从句结构，省略 that 的宾语从句作 be sure 的宾语。完整句是：
I'm not sure (that) I agree with you.
（我不确定我同意你的看法。）

Answer 2

我认为句子有错
应该是
I'm not sure if I agree with you.

我不确定我是否同意你。

If引导的宾语从句。