inversion is used in statements to give emphasis, especially when
the statement begins with a negative word or idea:
is, of course, necessary after neither, nor and so:
'Under no circumstances can your money be refunded.'
'Only when I had been there for a year did I begin to feel
'Not only did I lose all my clothes and jewellery, but
my chequebook, passport and visa card went too.'
'I don't like dried fruit.' 'Neither do I.
got chicken pox, so has his brother.