FOCUS - GRAMMAR AND NEGATIVE INVERSION
WHAT? WELL, INVERSION IS USED FOR EMPHASIS AND NEGATIVE INVERSION IS DOUBLE EMPHASIS [SORT OF] - 'UNDER NO CIRCUMSTANCES CAN YOU BOARD A TRAIN WITHOUT A TICKET.'
FROM THE 'HOME' OF BRITISH ENGLISH - THE BBC
EMPHASIS
LOOK AT THE SUBHEADING ON THE YELLOWISH PATCH - IS IT STRONGER WHEN YOU DO THIS TO IT? -