We use perfect perfect when we talk about an action happened before another one. The best example is this one: When I come home, I noticed that someone had been at my house.
As we see, when I came home, nobody was there. The theft happened when I was not at home.
It is important to use the next structure for making sentences.
Personal pronoun + had + participle> I had left when you came.
I had left when you came.
Questions
In order to ask questions, it is necessary to put the auxiliary verb had at the beginning of the sentence.
Had you left when I came?
Questions
In order to ask questions, it is necessary to put the auxiliary verb had at the beginning of the sentence.
Had you left when I came?
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