ut they don't realize one important thing...don't是否定动词的,而not后直接加动词,实际上中间省略了to,也就是说not to do是否定不定式的.
例如：He don’t like reading.
He promised not to do it again.
I am not really interested in fishing.中be interest in 是固定短语,意思为：对...感兴趣.是固定用法,因此不能说成I don't.
注：学英语一定要分析词句,并不是意思对了就可以了,还有很多差异的,一定要详加区分.