a) 1. Kate is reading a book now. 2. Bob and Jake are watching TV now. 3. Look! The dog is playing with the cat! 4. It's five o'clock.His parents are drinking tea.
b) 1. Is Kate reading a book now? 2. Are Bob and Jake watching TV now? 3. Is the dog playing with the cat? 4. Are his parents drinking tea?
c). Kate isn't reading a book now. 2. Bob and Jake aren't watching TV now. 3. Look! The dog isn't playing with the cat! 4. It's five o'clock.His parents aren't drinking tea.