Exercise 3. Сделайте предложения отрицательными. 1. You have been writing a report since morning. 2. Tom has been running for twenty minutes. 3. A cathas been sitting in the tree for an hour. 4. My parents have been travelling for a week 5. They have been walking since afternoon.

Упражнение 3. Сделайте предложения отрицательными. 1. You have not been writing a report since morning. 2. Tom has not been running for twenty minutes. 3. A cat has not been sitting in the tree for an hour. 4. My parents have not been travelling for a week. 5. They have not been walking since afternoon. Объяснение: Чтобы сделать предложение в Present Perfect Continuous отрицательным, мы добавляем `not` после `have` или `has`. Формула: `have/has + not + been + V-ing`.