就前面那句子而言,和汉语一样啊.
I think,我认为
I don't think 我不认为.
不是一样么?
只是:"我认为她是个老师"和"我认为她不是老师",都是肯定句.
"我不认为她 是老师","我不认为她不是老师"才是否定句.
看字面上来讲,当然是I don't think she is teacher,而不是I think she isn't teacher.啦