Please, dear teachers and friends...
Could you shed some light on this?
What's the difference between these sentences?
To do someone harm.
To hurt someone.
They mean essentially the same thing. Differences may be:
To do someone harm. To act in a way that results in physical, emotional, financial, social, etc. harm. It can have the sense of harm at a distance. One can act 'behind the scenes' to cause harm to another.
To hurt someone. This generally has the sense of a more direct action which hurts someone. I think the hurt/harm in this case is considered to be more limited: physical or emotional damage.
I hope this is helpful,