Simply put, the auxiliary has to be the second block of a negative or restrictive sentence. This is normally achieved by having the subject as the first block:
I have never seen such a ridiculous film.
You can choose to "front" the adverb but this involves a bit of shuffling:
Never have I seen such a ridiculous film.
Sometimes there isn't an auxiliary:
You rarely ..........
So we use "do":
Rarely do you.......
http://www.learnenglish.org.uk/grammar/ ... ion01.html
andl the links that work should explain the whole phenomenon of "fronting".
Questions are fronted, "So do I" as well. Passives are part of the same thing. If you get interested, google "fronting negative inversion" and stand well back.