bantu jawab susunan kalimat negative,positive,intrrogative dalam subjek play

Maaf ya, yang saya tau itu, subject cuma ada I, you, we, they, he, she dan it saja, jadi saya menjawab pake objectnya play, maaf kalo salah.
1. Positive sentence
I am playing football now.
2. Negative sentence
I am not playing football now.
3. Interrogative sentence
Are you playing football now?