Срочно нужна помощь! Поставить предложение в вопросительную и отрицательную форы

Отрицательные формы:1) Mary and her friends aren't playing basketball now.2) He isn't writing a composition right now.3) At present Doctor Watson isn't investigating another murder.Вопросительные формы:1) Are Mary and her friends playing basketball now?2) Is he writing a composition right now?3) Is at present Doctor Warson investigating another murder?