Задайте общий, особый, альтернативный и разделительный вопросы к каждому предложению:-

1) We discussed our problems.
   - Did we discuss our problems?
   - What did we discuss?
   - Did we discuss our problems or not?
   - We discussed our problems, didn't we?
2) She speaks English fluently.
    - Does she speak English fluently?
    - What language is she fluent in?
    - Is she fluent English or Spanish?
    - She speaks English fluently, doesn't she?
3) This article is interesting.
     - Is this article interesting?
     - What is interesting?
     - Is this article interesting or this magazine?
     - This article is interesting, isn't it?