I am trying to learn the (a bit too ‘spagetti’, as to me) form with Past Perfect + ‘no sooner’.
But the question is about the style. This is the example to illustrate it:
- He had no sooner arrived than he fell ill.
- No sooner had he arrived than he fell ill.
Why is the inversion had he in the second case?
I was only told that, for example, Had I been there, I would have helped her.
is more formal (style) than If I had been there, …
Is this the case (of just different level of formality)?