перевести: моя сестра пишет письмо в это время. предложение приобразовать в отрицательное и вопросительное настоящего длительного времени.

My sister is writing a letter at the moment.Is my sister writing a letter at the moment?My sister isn't writing a letter at the moment.

My sister is writing a letter at the moment.Is my sister writing a letter at the moment?Yes, she is. She is writing a letter at the moment.No she isn't. She isn't writing a letter at the moment.