When you agree with a positive sentence you say So do I.
‘I like cats.’
‘So do I.’
When you agree with a positive sentence you say So do/am/etc I.
(So + Auxiliary Verb + Subject)
• ‘I’d love to visit Poland some day.’
‘So would I.’
• ‘I’m going out with that sexy new assistant tomorrow.’
‘So am I.’
Remember: So for positives.
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Remember: So for positives.
‘I have a yellow T-shirt.’
‘So have I.’