Present Perfect. Change the sentences to negative.

1. I have called her today.

2. They have missed their chance.

3. It has been easy.

4. We have known each other for a long time.

5. We have worked on this together.

6. He has exercised this week.

7. She has put on a black dress.

8. I have tried to reach him.

9. He has failed to get their attention.

10. She has been sick lately.