GMAT Verbal Section | Re: Has/Have/Had been - Difference

This is good, but don't worry about the names of the tenses too much. They're pretty easy to understand from examples, so just remember the correct examples and you'll be fine. Besides, most of the time the GMAT only cares about simple tenses and gerunds, anyways, so this level of detail is superfluous for most GMAT takers.

---