Прочитайте предложения в видо-временной форме past perfect continuous, задайте cпециальный вопрос, начиная со слов данных в скобках: образец: it had been raining for an hour when they left. (how long …? ) how long had it been raining when they left? 1.they had been doing this work for several days when they got this offer. (how long …? ) 2. the clerks had been preparing the documents for an hour when their boss came. (how long …? ) 3. we had been skiing for half an hour when the snowfall began. (how long …? ) 4. i had been cooking for an hour when my friends came. (how long …? ) 5. the children had been watching tv for two hours when mother switched it off.. (how long …? ) 6.they had been discussing the contract since 10 a.m.when they came to agreement at last. (since when …? ) 7. he had been having a shower for ten minutes when this tv program began. (how long …? ) 8. the car had been running well since august when the accident happened. (since when …? ) 9. by the time i finished my shopping i had been walking for three hours.(how long …? ) 10. he had been playing tennis for some years before he could play well. (how long …? )

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