He is reading an interesting book at the moment.
He is not reading an interesting book at the moment.
Is he reading an interesting book at the moment?
He was reading an interesting book, then she came.
He was not reading an interesting book, then she came.
Was he reading an interesting book, then she came?
He will be reading an interesting book tomorrow.
He will be reading an interesting book tomorrow.
Will he be reading an interesting book tomorrow?