My grammar book says that if somebody says to me something and he uses the past tense, I can report his speech using either the past or past perfect. (In the first case I don't change the tense at all.)
For me it yields ambiguity. For example I hear this:
"John said that he was not enjoying his job very much."
My understanding is that John could have said two different things. And I'm not sure whether John is still working there or not.
John: "I am not enjoying my job very much.
John: "I was not enjoying my job very much.
Do native speakers always rely on the context in these situations to avoid ambiguity? Or there is something I'm missing?