After so and neither in follow-on statements: A: I like this site. B: So do I.
A: My children can't stand their new teacher. B:Neither can mine.
In some types of conditional clauses:
Had I known that, I wouldn't have left.
Should you have any questions, pleae do not hesitate to ask.
After as and so:
So strong was the wind, that all but the hardiest stayed indoors.
He was a freemason, as were his father and grandfather before him.
Inversion is possible in other situations too, but that gives an idea.
Student or Learner