need to understand POV better
I'm taking a creative writing class. The teacher often dings me for shifting perspective between characters when writing in third person. I trust him, he seems to know what he's doing. I guess I'm supposed to be writing limited omniscient third person.
But when I read, for example John Grisham's novels he seems to shift point of view between characters quite readily.
I guess I'm wondering what constitutes a shift and is it bad writing to shift POV like this, so indiscriminately, or is my professor just trying to establish some basic discipline and understanding upon a novice, before moving on to more complexity?
Thanks for your help
Nelson