So / Neither

To agree with a positive statement:
We use so + auxiliarymodal verb + pronoun:


'I like tea without sugar.'
'So do I.'


To agree with a negative statement:
We use nor/neither + auxiliarymodal verb + pronoun:


'I don't like tea with sugar.'
'Nor do I.' or 'Neither do I.'


To disagree with a positive statement:
We use pronoun + auxiliarymodal verb + not (-n't):


'I like tea without sugar.'
'I don't.'


To disagree with a negative statement:
We use pronoun + auxiliarymodal verb:


'I don't like tea with sugar.'
'I do.'

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