Past continuous три формы

Утвердительные предложения:I was playingWe were playingYou were playingYou were playingHe / she / it was playingThey were playingВопросительные предложения:Was I playing?Were we playing?Were you playing?Were you playing?Was he / she / it playing?Were they playing?Отрицательные предложения:I was not playingWe were not playingYou were not playingYou were not playingHe / she / it was not playingThey were not playing

He was reading a book. He was not reading a book. Was he reading a book?