Past Perfect   

  1. After they ............................. (finish) homework, they ....................... (go) to the playground.
  2. As soon as he ....................... (wash) his car, he ............................... (have) a shower.
  3. They ....................... (have) to water the flowers as they ...................... (not do) it before.
  4. She ......................... (not be) interested, because she ........................ (see) that film before.
  5. The players .................. (shout) loudly as soon as they ...................... (hear) the news.
  6. I ............................. (already try on) five shirts before I finally ................. (decide) which to buy.
  7. My brother .................... (go) to the North Sea after he ....................... (learn) to swim.
  8. We ......................... (be) really helpless after our computer .................. (crash).
  9. He ....................... (eat) the apples he ........................... (buy) on his way home.
10. When the teacher ............... (enter) the classroom,  the pupils ................... (already take out) their books.

Key:

  1. had finished / went
  2. had washed / had
  3. had / hadn't done
  4. wasn't / had seen
  5. shouted / had heard
  6. had already tried on / decided
  7. went / had learned
  8. were / had crashed
  9. ate / had bought
10. entered / had already taken out