He won't often go to work.
Not often will he go to work.
She seldom worked very hard.
Seldom did she work very hard.
I had never met someone so interesting.
Never had I met someone so interesting.
I didn’t know what to do until I saw what had happened.
Not until I saw what had happened did I know what to do.
I rarely go outside.
Rarely do I go outside.
He understood little about the situation.
Little did he understand about the situation.
She hasn't seen him anywhere.
Nowhere has she seen him.
We would understand what had happened that night only later.
Only later would we understand what had happened that night.
The children should on no account go on their own.
On no account should the children go on their own.
They had met such rude people nowhere before.
Nowhere had they met such rude people before.
They don't ever know what to do.
Never do they know what to do.