Put the verb into the correct form. 1. We haven't solved (not/solve) the problem yet. 2. I have already done (already / do) my homework. 3. The lecture (not/yet/begin). 4. (you / ever/be) to Australia? 5. (she / put) a camera? 6. (change) so much. 7. My friend (not / arrive / yet). 8. (you / hear) from Ann recently? 9. (you / have) a holiday this year? 10. (never / drive) a car. 11. (not/eat) anything since breakfast. 12. (already / see) this film. 13. (buy) a newspaper. 14. (improve) so much. 15. (lose) his phone.