Let's take a closer look at what "being" really means; then you'll always be able to tell when 'being' has been used correctly:
Consider the following:
Incorrect: Joe is being a student. (Joe just
is a student.)
Correct: Joe is being annoying.
Why does it 'sound wrong' to say that he is being a student, but it 'sounds right' to say that he is being annoying?
What 'being' indicates is a
process-- that is, something you can control, can turn on and off. You use 'being' when someone/something is in a process.
Ex. (correct usage): The apartment being renovated will sell quickly in the current market. (=The apartment that is
in the process of being renovated...)
If the verb or description is just a
state of being (not a process of being), as in, "I am happy," then 'being' doesn't make sense. You cannot say, "I am being happy" because an emotional state is not process that can be turned on and off.
This is why most of the time noun+being is incorrect on the SC.
One last note: You can use 'being' as a subject or object.
Ex. I like being a student.
Ex. Being a student can be fun.
For a list of 'being' phrases that are ALWAYS incorrect on the GMAT, checkout the Modifiers lesson at gmaxonline!
If this helped, kindly give Kudos!