Преобразовать в отрицательную форму предложения skiing is a winter sport, dogs are friendly.

Skiing is not a winter sport,dogs are not friendly.

Skiing is hot  a winter sport,dogs are not friendly.

1. I was tired after I had played basketball.

2. She had finished writing letters before your mother arrived.

3. The child had cut his finger before we could take the knife from him.

4. We moved home after the rain had stopped.

5. He had decided to study French before he left school.

6. Sam had worked hard before he could get success.

7. The house had been built before the tornado ruined it.

8. My brother had received an email before he wrote back.

9. I had bought a new dog after my old dog died.

10. They had taken up playing tennis before they saw the tennis tournament on TV.

novel - a type of booknovel - a type of bookseries - a set of different parts of a booknovel - a type of bookseries - a set of different parts of a bookreader - a person who reads a booknovel - a type of bookseries - a set of different parts of a bookreader - a person who reads a bookwriter - a person who writes a booknovel - a type of bookseries - a set of different parts of a bookreader - a person who reads a bookwriter - a person who writes a bookcharacter - a person who we read about in a book