1) The teacher told the student sternly to pay attention in class.

2) The manager stared sternly at the employee who was consistently late.

3) The police officer spoke sternly to the suspect during interrogation.

4) The parent warned their child sternly about the dangers of running into the street.

5) The judge looked sternly at the defendant as they awaited the verdict.

6) The coach spoke sternly to the players after a disappointing game.

7) The principal addressed the students sternly about the vandalism in the school.

8) The boss reminded the team sternly about meeting deadlines.

9) The sergeant commanded his troops sternly to stand at attention.

10) The librarian told the noisy patrons to quiet down sternly.