I'd like to know why some inversions need an auxiliary and others don't need one. For example: "Little did I know about her" auxiliary + subject + verb Why not "Little knew I about her", which is also an inversion?
But Here comes the sun; Adverb + verb + subject or down came the rain: Adverb + verb + subject Why not "Down did the rain come"?
They are all inversions, but some use an auxiliary and some just the verb. Thank you so much in advance!