'SO + vb + pers.
I am British /'SO' am i
I was sad / 'SO' was i
I ate pizza / 'SO' did i
I can swim /'SO' can i
I have been to India / 'SO' have i
'NEITHER' + vb + pers.
I am not British /'NEITHER' am i
I was not sad / 'NEITHER' was i
I did not eat pizza / 'NEITHER' did i
I can not swim / 'NEITHER' can i
I have not been to India / 'NEITHER' have i

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English Grammar Tips (I)
Non-FictionGrammar, vocabulary, interviews. Everything you can imagine, ...