Change the verb into the correct form: 1. The students (improve). 2. She (become) really beautiful. 3. Man (invent) many great inventions. 4. People (cause) much destruction to the planet. 5. I (learn) to surf. 6. The class (do) 5 tests this month. 7. Allison (find) a few problems with your plan. 8. We (consult) some doctors about this. 9. I (meet) Debbie in the last week. 10. In the previous year, we (double) our income. 11. She (be) sick since Sunday. 12. You (be) away for 2 weeks. 13. He (hate) cheese since childhood. 14. Mark and Katie (be) together for two years. 15. I (like) mango since my last trip.