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?