1. in spring; 2. In January, 3. at 6 pm, 4. by 2 o'clock 5. on Tuesday 7 last week, 8 this month. 9. at midnight, 10. since last summer, 11. at half past six, 12. quarter past nine, 13. since morning to 14. by night, 15. last winter, 16. since last Monday, 17. by the winter, 18. in 1998, 19. since 1998, 20. At dawn, 21. in the morning, 22 at sunset, 23. next year, 24. on March, 25 to 25. by the 10th of December.