So do i

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So do I

The expression 'so do I' is formed using so plus the emphasized auxiliary verb. Don't forget to invert the subject and the auxiliary verb:
He is worried about the changes. So am I. He is worried about the changes, and I am also worried.
They arrived yesterday. So did we. We all arrived yesterday.
Philip likes his job. So does Kevin. Philip and Kevin both like their jobs.
She should sign up now. So should you. You should both sign up now.
More informally, we can also say:
Me too
You too

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