Повествовательная форма:

She is singing a song.They are buying groceries.He is cooking dinner.I am changing my outfit.We are playing football.She is dancing at the party.

Отрицательная форма:

She is not singing well.They are not buying a new car.He is not cooking tonight.I am not changing my mind.We are not playing video games.She is not dancing with him.

Вопросительная форма:

Is she singing a new song?Are they buying tickets for the concert?Is he cooking dinner for us?Am I changing the plans?Are we playing basketball tomorrow?Is she dancing salsa tonight?