4. Transform the sentences into negative and interrogative. • By the time mum came home her son had cooked the dinner. • Sandra had been writing a report for three hours before she realized it was too late. • This bridge was built in 1953. • Tom was reading a very interesting book while his dad was watching a football match.

• By the time mum came home her son hadn't cooked the dinner. Had her son cooked the dinner by the time mum came home?
• Sandra hadn't been writing a report for three hours before she realized it was too late. Had Sandra been writing a report for three hours before she realized it was too late?
• This bridge wasn't built in 1953. Was this bridge built in 1953?
• Tom wasn't reading a very interesting book while his dad was watching a football match. Was Tom reading a very interesting book while his dad was watching a football match?

Ответ: См. решение