1. is watching ( HTTD - now - S là he - dùng is - Ving )
2. are sitting ( HTTD - at present - S là they - dùng are - Ving )
3. are learning
4. is playing ( HTTD - look ! - S là Peter - dùng is - Ving )
5. is sleeping ( HTTD - be quitet ! - S là the baby - dùng is - Ving )
6. is smoking ( HTTD - look ! - S là the man - dùng is - Ving )
7. is writing ( HTTD - now - S là she - dùng is - ving )
8. is working ( HTTD - at the moment - S là my father - dùng is - Ving )
9. Is ( HTTD - câu hỏi - đảo is lên đầu ) / listening ( HTTD - now - S là John - dùng is - Ving )
11. are working ( HTTD - at the moment - S là số nhiều - dùng are - Ving )
12. are always making ( HTTD - please be quite - S là you - dùng are - Ving )
13. isn't having ( HTTD - at the moment - S là Tony - dùng is - Ving )
14. is reading ( HTTD - Listen ! - S là he - dùng is - Ving )
15. is studying ( HTTD - at present - S là Richard - dùng is - Ving )