Поставьте следующие предложения в вопросительную и отрицательную форму. дайте краткие ответы на полученные общие вопросы. 1). my pen is bad. 2). this is my flat. 3). his flat is large and clean.

1)My pen isn't bad.
Is my pen bad? - Yes, it is/No, it isn't
2)This isn't my flat.
Is this my flat? - Yes, it is/No, it isn't
3)His flat isn't large and big.
Is his flat large and clean? - Yes, it is/No, it isn't