我这个造句是否有语法错误，英语达人帮我看看，谢谢

Question

用affirm 和 affiliate造句

I affirmed that he doesn't affiliate with that academic society.
希望表达的意思是，我确证他不是那个学术团体的成员。

请英语达人帮我看看，句子有没有问题

Answer 1

错误,因为你的主句用的是过去式(affirmed),则宾语从句不能用一般现在时.

正确的是:

I affirmed that he didn't affiliate with that academic society.

Answer 2

时态不一致。