我这个造句是否有语法错误,英语达人帮我看看,

问题描述:

我这个造句是否有语法错误,英语达人帮我看看,
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

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.