So, Neither, Nor

Use
To indicate that we have the same feelings, behaviour or abilities as others, we can use so (positive statements), and neither or nor (negative statements).

Form
so/neither/nor + (modal) auxiliary verb or the verb to be + subject noun or pronoun.
The rules for deciding which verb is used after so, neither or nor are the same as those for questions tags. The verb is always positive. The clause with so, neither or nor can appear in the same sentence as the main clause, or it can be said by a different speaker.
She can't play a musical instrument and nor can I.
I'll phone him tonight. So will I.
My mum isn't working tomorrow. Neither is mine.

If our feelings, behaviour or abilities are different from those of others, we use the following structure:
subject + (modal) auxiliary or the verb to be.
He doesn't eat meat but I do.
We're allowed to wear jeans to school. We aren't.