make the sentences negative:
1. Before she started writting a report she had read the story very attentively.
2. He has been to a few cities and towns in the south of France.
3. Before their competitors held the exhibition they had started producing two new models.
4. They are sure the company will have increased production by the beginning of next year.
5. We have carefully studied the graph.
Помогите пожалуйста