Jane watched the television, so did Jack  + +

Jane played tennis, but Jack didn't. + -

Jack didn't read, neither did Jane - -

Jane didn't dance, but Jack did. - +

Choose to compare to yourself

Jane played football, so did I / but I didn't.

Jack went bowling, so did I / but I didn't.

Jane visited London, so did I / but I didn't.

Jack played table tennis, so did I / but I didn't.

Jane and Jack didn't go camping, neither did I / but I did.

Jack didn't play football, neither did I / but I did.