The Past Perfect Tense:
We can use the Past Perfect when we express two actions happened in the past , but one
action happened before the other one. We use either (After , Before , Because )with it.
( After / Because ) + Subject + had + (verb)Past Participle , Subject + Verb ( Simple Past )
e.g. 1.After I had finished my work , I went home .
2.She succeeded because she had studied hard
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