My friend was reading an interesting book at 4 p.m. yesterday. Напишите пожалуйста общий вопрос, альтернативный, специальный,вопрос к подлежащему, разделительный вопрос

Who was reading an interesting book?

My friend was reading an interesting book at 4 p.m. yesterday.  Was my friend reading an interesting book at 4 p.m. yesterday? Was my friend reading an interesting book or writing a letter at 4 p.m. yesterday? Who was reading an interesting book at 4 p.m. yesterday? My friend was reading an interesting book at 4 p.m. yesterday, wasn't he?