4. I still (to write) a letter. 5. They (to play) football. 6. It (to snow) now. 7. She (to explain) a grammar rule. 8. We (to have) dinner now. 9. Who (to speak) with you? 10. It still (to rain). 11. Why you (to talk)? 12. They (to eat) soup. 13. The girl (to draw) a picture. 14. My son (to swim) to the shore. 15. Her daughter (to play) chess at the moment.

1. I am still writing a letter. (Я все еще пишу письмо.)
2. They are playing football. (Они играют в футбол.)
3. It is snowing now. (Сейчас идет снег.)
4. She is explaining a grammar rule. (Она объясняет грамматическое правило.)
5. We are having dinner now. (Мы сейчас ужинаем.)
6. Who is speaking with you? (Кто с тобой разговаривает?)
7. It is still raining. (Все еще идет дождь.)
8. Why are you talking? (Почему ты разговариваешь?)
9. They are eating soup. (Они едят суп.)
10. The girl is drawing a picture. (Девочка рисует картину.)
11. My son is swimming to the shore. (Мой сын плывет к берегу.)
12. Her daughter is playing chess at the moment. (Ее дочь играет в шахматы в данный момент.)

Ответ: смотри решение выше