Past perfect

I- The form:

It is composed of two parts.
Had +  Past participale of the main verb.

Ex: To decid

Affirmative                Negative                    Interrogative

I had decided              I hadn't decided
You had decided         You hadn't decided
He had decided           He hadn't decided
She had decided          She hadn't decided
It had decided             It hadn't decided
We had decided          We hadn't decided
You had decided         You hadn't decided        
They had decided        They hadn't decided

Rule:

• Affirmative               : Subject + Had + Past participale.
• Negative                  : Subject + Hadn't + Past paricipale.
• Interrogative             : Had + Subject + Past participale?
• Interrogative negative: Hadn't + Subject + Past participale?

II- Uses:

• The past perfect refers to a time earlier than before now it's used to make it clear that one even before than other in the past it doesn't matter which event mentioned first, the tebse ( P.P ) makes it clear which which event happen first.

Ex: - John had gone out when I arrived in the office.
      - I had saved my document before the computer crashed.
      - When they arrived; we had already standed cooking.

• We use in the sequence of past event.

Ex: - After I had had a shower, I went to bed.
      - Before she got the degree, she had studied four years.
      - As soon as he had entered the roo, I pickrd up my books.

Remark:

When we have " After " or " As soon as " in the middle of sentence we can use simple past or past perfect.

• Hardly had me arrived than t is started to rain.
• Scarely had she left than her husband phoned.
• We used in the indirect speech.

Ex: - She explained that she had worked there for 3 years.

• We used in the conditional type III

Ex: - If they had known the truth they would have appologized

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