Ответ:

1. didn't he?

2. did he?

3. didn't they?

4. didn't they?

5. did they?

6. weren't they?

7. didn't they?

8. didn't they?

9. didn't it?

10. did it?

11. wasn't it?

Объяснение:

Если в первой части предложения идет утверждение, ставим в "хвостик" отрицание. Если же в первой части отрицание, то в "хвостик" идет утверждение. Если есть такое слова как rarely, seldom, never - в "хвостик" ставим утверждение.