Don't is a shorter way to say 'do not' whilst doesn't is a shorter way to say 'does not'.
You wouldn't really say 'My Mama do not like you', you'd say 'My Mama doesn't like you' so really the song isn't grammatically correct....So the teacher is correct!
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February 23, 2017
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'Thanks in advance' is sometimes used, usually via email rather than verbally. I've never heard the phrase 'Thanks beforehand' being used, and it isn't a phrase I would use.
Hope that helps!
