“我不是不理解他”用英语怎么说

It's not I don't understand him

It's not that I don't understand him,这是个用到强调结构的句子

it's not that i don't understand him.(北美口语格式)

英语少用双重否定，比较简单的说法是
I do understand him, but ...
强调我确实理解他，但是....

I'm not disunderstand him
句子要的就是精简干练!

not that i don't understand him
简单直接