Bài tập 4: Chọn động từ tobe thích hợp để hoàn thiện những câu dưới đây 1. Tony ( is / are ) helping his mother now. 2. They ( am / are ) learning English at the moment. 3. My sun ( is / are ) having lunch at present. 4. My cat ( is / are ) sleeping on the chair. 5. I ( is / am ) writing the novel. 6. It ( is / are ) raining heavily. 7. The dog (is/are) barking. 8. My neighbor ( is / are ) washing his motorbike now. 9. John ( is / am ) playing a watching the film in his room. 10. Some dogs ( is / are ) barking outside. 11. The teacher ( is / are ) laughing at the moment. 12. I ( are / am ) waiting for you. 13. The baby ( is / are ) crying. 14. Jane and Fred ( are / is ) dancing the tango. 15. They ( am / are )eating a pizza