She wasn't reading an interesting book from 4 till 6.Was she reading ...?Who was reading ...?When was she reading a book?What was she reading from 4 till 6?Was she reading a book or a magazine ?She was reading a book,wasn't she?We weren't writing a letter at 2 o'clocklast Sunday.Who was writing...?What were we writing at 2 o'clocklast Sunday?When were we writing a letter?Were we writing a letter...? We were writing a letter,weren't we?Were we writing a letter or an article ?