so/nor/neither AUX nThe auxiliary verb follows one of the conjunctions so, nor, or neither and is followed by a noun group. The noun group is the Subject of the auxiliary verb, and is often a personal pronoun.
|so/nor/neither||Auxiliary verb||noun group|
This pattern is used with be, do, and have to indicate a situation that is similar to one mentioned in a previous clause, but with a different person involved.
'I'm working at home on Wednesday.' 'So am I.'
He never spoke of my mother; nor did my aunt or my gran.
'I've never been to Alcatraz.' 'Neither have I.'
This pattern, with nor, is also used to confirm a previous clause. This is a formal use. In spoken English, the stress is on the auxiliary rather than the Subject.
He confirmed there and then: 'I will never race again.' Nor did he.