In Expressions^x, Direct questions^x, Negatives^x

Hi Giuseppe, and welcome! The structure you're referring to is called "inversion." Your examples fall into a singular category (that of negative/restrictive expression) which includes other expressions, such as barely, scarcely, hardly, seldom, little, never, under no circumstances,...

. direct question negative adverbs that begin a sentence comparison adv place at the beginning of a sentence omission if expressions with'only' that begin a sentence so, neithe, nor