Cuando adverbios negativos abren una frase para dar énfasis, se invierte el orden de las palabras, como si fuese pregunta, pero no lo es, claro. Unos ejemplos:
I seldom work on Sundays. Seldom do I work on Sundays.
She will never do that again. Never will she do that again.
You will find this nowhere else. Nowhere else will you find this.
I seldom visited her in those months. Seldom did I visit her in those days.
We rarely drink after six. Rarely do we drink after six.
He insulted me and also took my car. Not only did he insult me, he also took