Exercise 2. Put the predicate in the appropriate Tense, paying attention to its Voice.
1. The animals (examine) by the students every day. 2. The students (examine) the animals every day. 3. This cow (treat) by our veterinarian last week. 4. Our veterinarian (treat) this cow last week. 5. Penicillin injections (make) by the veterinarian tomorrow. 6. The veterinarian (make) penicillin injections tomorrow. 7. The students (treat) sick animals next year. 8. Sick animals (treat) by the students next year. 9. Infectious diseases (cause) by microbes. 10. Microbes (cause) infectious diseases. 11. These animals (operate) by our veterinarian last week. 12. Our veterinarian (operate) these animals last week. 13. This disease (cause) by a virus. 14. Viruses (cause) many diseases. 15. The sick calves (isolate) by the dairy men tomorrow. 16. The dairy men (isolate) the sick calves tomorrow.