So do I means “me too”: you agree that what the other person said about themselves is true of you as well. I love jazz. — So do I. It isn't a fixed phrase: do changes to match the first line, so am I, so did I, so can I.
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I like… — So do I; I'm… — So am I; I went… — So did I; I can… — So can I; I don't… — Neither do I
- — I love travelling by train. — So do I, it's so relaxing.
- — I'm starving after that walk. — So am I, let's find a café.
- — I watched the match last night. — So did I, what a finish!
What changed
First version— I'm really nervous about the exam. — So do I.
Revision— I'm really nervous about the exam. — So am I.
After so, you repeat the auxiliary verb from the first line. I'm nervous contains am, so the reply is So am I. Do is used only when the first line has an ordinary verb in the present tense: I like…, I work… — So do I.
Me too means the same and works almost everywhere, but it sounds simpler and more conversational: I'm tired. — Me too. After a negative, so doesn't work: I don't eat meat. — Neither do I or Me neither, not So do I.
Your turn
— I went to bed at two last night. — ___, I couldn't stop reading.
Show the answer
So did I — The first line is in the past tense: I went. So the reply repeats did: So did I. So do I is for the present: I go to bed late.
A friend tells you about a habit of theirs. Write their line and your reply with so do I, then add when you do it yourself.
— I go for a run every morning. — So do I! I usually run at seven, before breakfast.
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