They didn't know he had stolen all of their money
Little did they know that he had stolen all of their money
We never went to the shopping centre (Use "At no time")
At no time did we go to the shopping centre
If you see Nigel, give him my regards
Should you see Nigel, give him my regards
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
She seldom worked very hard
Seldom did she work very hard
I rarely go outside
Rarely do I go outside
I would have bought a new house if I had had enough money
Had I had enough money, I would have bought a new house
Peter didn't understand the situation. If he had, he would have quit
Had Peter understood the situation, he would have quit
She bought the car after he had explained its benefits
Only after he had explained its benefits did she buy the car
I had never met someone so interesting
Never had I met someone so interesting