Ответ:

1) I said nothing at all

2) I told them nothing

3) Who said it's right?

4) Who told him the news?

5) He said it was mistake.

6) And then she said something strange.

7) The teacher told us to bring the textbooks.

8) The teacher said we must bring the textbooks.

1. said
2. told
3. said
4. told
5. said
6. said