Поставьте следующие предложения в вопросительную и отрицательную форму. 1. не has some new english books. 2. there were some magazines on his table 3. they can speak some foreign languages. 4. he knows some engineers of our office. 5. we sent some letters to foreign firms yesterday. 6. our director received some businessmen the day before yesterday. 7. they will discuss the terms of delivery with them next week. 8. they are having talks with their partners. 9. they have concluded an agreement lately.