- Did you find out who was behind that action?
- Did you find out who had been behind that action?
So Past Perfect refers to events that happened before the main event. So i think 2 is correct but 1 is used rather than 2. Then why is 1 correct?
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Sign up to join this communityIf you use the past perfect "Did you find out who had been behind that action", you are choosing to refer to the events relative to some focus point in the past.
I emphasise "choosing", because in many cases this is a completely free choice.
Sometimes, if you don't, clarity will be compromised because the sequence of events is important, and might not be clear.
But often, it makes no difference to the clarity whether you bring in that temporal focus or not. And indeed, native speakers often do not bother with the past perfect when the meaning is clear without it.
first sentence belong to past perfect,and second one belong to past perfect continous
the first sentence looks back to the past from the present and the second sentence looks back from the past to a point further back in the past.