Прочитайте предложения в видо-временнойформе present perfect continuous, задайте cпециальный вопрос, начиная со слов данных в скобках: образец: it has been raining since morning. (since since when has it been raining? 1.he has been working at this problem since august. (since when …? ) 2. they have been studying the contract for two hours. ( how long …? ) 3.the managers have been discussing this matter for half an hour. (how long…? ) 4. they have been dancing since nine. (since when …? ) 5. she has been speaking on the phone for half an hour. (how long …? ) 6. the children have been watching tv since morning. (how log 7. he has been reading since three o‘clock. (since when …? ) 8. they have been doing this work for two hours. (how long …? ) 9. you have been playing computer games since nine. (since when …? ) 10. my boss has been writing a report for two hours. (how long …? )