1. Don’t come in now. The boss … (is talking) on the phone.
2. Our company … (does not produce) medical equipment.
3. Your English is better now. You … (are making) progress.
4. Ms. Johnson … (teaches) Math.
5. The Earth … (goes) around the moon.
6. Dunkin often … (takes) his father’s car.
7. We … (are finishing) the project.
8. Look! A star …is (falling)!
9. The director’s assistant … (speaks) 3 foreign languages.
10. A leather bag … (costs) a lot.
11. I … (do not know) how to do it.
12. I … (understand) that you … (are not speaking) the truth.