1. it's too early now to discuss this question. 2. it's important to tell him today when we leave. 3. it's winter. it's cold enough. it often snows and sometimes I want to stay at home. 4. it's difficult to get up early in winter because it's still dark in the morning. 5. Boris knows German and French, that's why it's easy for him to learn English. 6. is it hard for you to walk? let's take a taxi. 7. it's not surprising that Sidorov has graduated from the institute at last, he has studied a lot. 8. is it already raining? not yet but it's going to rain soon. 9. when I left home, it was raining. 10. how often does it rain here? 11. it was raining in the morning and it's snowing now. 12. it snowed a lot last week