Составьте 4 предложения в present continuous и каждое из них еще в отрицательной и вопросительной форме ()

He is reading a book now. Is he reading a book now? He isn't reading a book now.
My mother is cooking dinner. Is my mother cooking dinner? My mother isn't cooking dinner.
Students are writing a test now. Are students writing a test now. Students aren't writing  a test now.
I am sleeping now. Am I sleeping now. I am not sleeping now.