Can one person be both a counselor and a teacher writing a recommendation?

<p>Since I'm an international it's not so easy for me to find teachers speaking English fluently, who would help me with filling in my application quickly.
I was wondering whether I can assign one of my teachers to be both a counselor and a teacher writing a recommendation?
I really would like this teacher to fill both my reports and write a recommendation since she knows the most about me from all my teachers.
Or will it be a bad thing to do since both a counselor and teacher have to attach their opinion about me?</p>