1. They/walk in the park now. (4) 2. The boys ride horses. (+)
3. They /build a new house now. (+)
4. Ilearn Russian. (-)
5. Sophie /eat
berries now. (-)
6. It snow. (?)
7. Kevin /work at the moment. (?)​

1. They are walking in the park now.

(Так как там у Вас 4 в скобках, я напишу отрицательное и вопрос).

Are they walking in the park now?

They aren't walking in the park now.

2. The boys are riding the horses.

3. They are building a new house now.

4. I am not learning Russian.

5. Sophie isn't eating berries now.

6. Is it snowing?

7. Is Kevin working at the moment?

Обьяснение: везде P.C. так как точного задания не было, удачи.