Tell a teacher
Tell a teacher, parent, guardian or the police.
Tell him to stop or you should tell someone such as your parents or teacher as this is wrong.
If your trying to tell an eleven year old girl that you like her just go up to her and tell her if you like that much you wouldn't be embarrassed to tell her you like her and if she doesn't like you back then just act cool no big deal. That's coming from an experienced 11 year old girl its the best thing to do.
You should find someone your own age to "like".
Well it seems a little odd that this 11 year old loves her teacher that's in his/her 30s. To put it bluntly, no this teacher is much too old for a person that young. Now if its like a family love then yes, romantically no.
Of course its possible for an 8 year old can be a teacher.!
Can parents tell a 17 year old that they can have a boyfriend if the guy is like 15
Tell him you like him.
You don't. The girl won't even be able to tell very well between "like" and "like-like" until puberty and societal media sinks in.
Wait till you are 13.
If you like her try talking with her and getting to know her and tell her you think she is cute or you could actually tell her you like her. If you talk to her, compliment her, treat her nice, and flirt with her she will know you like her.