The importance of knowing what is pronoun refers to may be illustrated by the following example:
My husband and I stopped by a fast food place on a recent evening. He went into the house holding his hamburger and came out without it. When I asked where he put the wrapper, he replied, “in the trash can, but I tucked it where she can’t see it.”
He looked totally baffled when I responded, “she doesn’t need to see it to fish it out and eat the paper.”
Then we smiled as we realized we weren’t referring to the same SHE. His “she” is our daughter who disapproves of eating meat, especially fast food. My “she” is the cat who digs anything that smells interesting out of the trash and tries to eat the package.