Question

It had been raining since morning? Which aspects is this?

Answer 1

Answer:

Yes, this is the past perfect tense and is correct if you are talking entirely about the past. For instance, a story might begin, “It had been raining since morning. Naomi looked out the window at the wet pavement…” [The past perfect indicates an event which began before another event in the past].

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Answer 2

Answer:

it's past perfect tense