Present Simple:

Вопросительное: Do you say hello to everyone you meet?Отрицательное: She doesn't say much during meetings.Утвердительное: They say that laughter is the best medicine.

Past Simple:

Вопросительное: Did she say anything about the project yesterday?Отрицательное: He didn't say goodbye before leaving.Утвердительное: The teacher said we could start working on our projects.

Future Simple:

Вопросительное: Will you say a few words at the ceremony tomorrow?Отрицательное: They won't say anything until they have more information.Утвердительное: She will say yes when he proposes.