2b1. Is it snowing at the moment?2. Does it snow in November?3. It never snow in August.4. It is snowing5. Will it snow tomorrow?6. Did it snow yesterday?7. Does the sun shine every day?8. The sun doesn't rise early in autumn9. Sophia Paleologus came to Moscow...10. refused11. is sitting12. pays13. will be14. are you thinking15. do you think16. skies17. he is skiing18. to ski19. are skiing 20. skied21. didn't skiНасчет 13, 14, 15 и 19 не уверена.