Use the Past Perfect to describe an action that happened before another past action, usually together with Past Simple. It often appears with words like before, after, already, just, but Past Simple may also be used if the sequence is clear.
9. When I to the station yesterday, I that my train already . (to come, to learn, to leave)
10. What he when you him yesterday? (to do, to see)
11. I you this book as soon as I reading it. (to give, to finish)
12. When the ship the ocean, a great storm out. (to cross, to break)
13. I of her. (never to hear)
14. To whom you just ? (to write)
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