1. I/do my homework
→ I am doing my homework.
2. Bella/talk on the phone
→ Bella is talking on the phone.
3. We/listen to CDs now
→ We are listening to CDs now.
4. The children/ride to the park
→ The children are riding to the park.
5. It/rain very hard now
→ It is raining very hard now.
6. She/bake a chocolate cake
→ She is baking a chocolate cake.
7. You/dance very beautifully
→ You are dancing very beautifully.
8. Mark and his friends/have lunch
→ Mark and his friends are having lunch.