B 1.2 Agreeing and Disagreeing- So do I, Neither do I, etc

“So Do I” and “Neither Do I” are both used to agree with the speaker.

The only difference is that “So Do I” is for positive statements

and “Neither Do I” is for negative statements.

Some examples:

To agree with a positive statement:

We use so + auxiliary/modal verb + pronoun:

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

To agree with a negative statement:

We use nor/neither + auxiliary/modal 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 + auxiliary/modal verb + not (-n't):

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

To disagree with a negative statement:

We use pronoun + auxiliary/modal verb:

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

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