VI. Past Perfect 1
 Make the sentences interrogative.
 1) The enemy had destroyed the toví before 1942.
 2) They had gone for a walk before they finished working.
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 3) The travellers lost their way because they had left the map in the camp.
 4) She called them back after she had arrived.
 2
 5) The show had begun before they entered the hall.
 6) The group had become popular by the end of the 21st century.
 ?
 7) The writer had finished the book before the war broke out.
 ?
 8) We had found the information by the end of the week.
 ?
 9) Thad left school before it was repaired.
 10) The tourists had reached the camp before the thunderstorm began.