Occasionally I see constructs like this in English sentences:


  
  Not only is this true in this case, but ...
  


What puzzles me is the "is this" part of it. The sentence is not a question, yet it seems to have a question-like order. Isn't this correct/preferred:


  
  Not only this is true in this case, but ...
  


Are there other cases where non-question sentences contain question-like parts (so to speak)?


Question: How best can I discover what is up with my electrical bill?
Answer: One thing not addressed in your question is how many kW-hrs you are using compared to your neighbors. You can't just compare on dollars. In TX with the deregulated electrical industry, you could very easily be paying 2-3 times what your neighbors are paying per kW if you haven't checked it recently. Last summer I switched companies to get from ~$0.19 to $0.092, while keeping the 100% renewable energy sources that I had before. Go to www.powertochoose.org, a site set up by the TX Utility Commission, to compare rates.