Inversion with negative adverbials and cleft sentences to add emphasis. 

Never ____ I forget the kindness they treated us with.

Under no circumstances ______ students allowed to speak during the exams this week

We thought he was lying. Only later ______ we realise that he had told us the truth

____ was my uncle who told me the terrible news

It ___ my high school teacher who inspired me to become a journalist.

It was amazing. Never ____ I seen such an exciting tennis match.

Playing football is easy. ____'s all the training that I dislike