I don't(know)the teacher,but I(know about)her.可以换成know about

I don't(know)the teacher,but I(know about)her.可以换成know about I relly don't know ( ) about it. I don't know about the key to success,but the key to failure I don't know the man____ ther're talking about i don't know what to( ) about the football march. I don't know the teacher----- is I don't know her but i don't know I don't know her,but I know her name.为什么用her不用his i know ,so i don't take about I don't know much about us at last year ,but I'm have a lot I don't know what are you thinking about?还是I don't know what