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The past perfect ( progressive): had + been + verb in -ing form
Examples :
o Ex. When Peter went to the theatre, he discovered that all the seats had been sold.
o Ex. I had been waiting for 20 minutes when Paul arrived.
Examples :
o Ex. When Peter went to the theatre, he discovered that all the seats had been sold.
o Ex. I had been waiting for 20 minutes when Paul arrived.
