Нужно переработать предложения в отрицательные и вопросительные . Past Simpl Tense

1) Gymnastics was fun to do. Gymnastics wasnt fun to do. Was gymnastics fun to do? 

2) The teacher might open the window in the lesson. The teacher might not open the window in the lesson. Might the teacher open the window in the lesson?

3) Students could wear trendy clothes. Students couldnt wear trendy clothes. Could students wear trendy clothes?

4) I was in the country last summer. I wasnt in the country last summer. Was I in the country last summer?