Поставить предложения в вопросительную форму и дать ответ. 5)They had been to many countries. 6)Nobody has seen your dog. 7)We shall have signed this contract by next Tuesday. 8)Our engineer has used your method recently.
5)Had they been to many contries? Yes, they had 6) Has nobody seen your dog? No, nobody has 7)Shall we have signed this contract by next Tuesday? Yes, you shall 8) Has our engineer used your method recently? No, he hasn't.