3.Put the next sentences into negative and interrogative forms.
Поставте наступні речення у заперечну та питальну форми.
1.He was writing the business letter at that moment. 2.I was going to the post office. 3. She was driving her car. 4. They were preparing to the next class. 5. We were helping to our master. 6. I was looking out of the window. 7. He was driving the whole evening. 8. She was doing that exercise. 9. They were talking there. 10. I was reading the book.