Which is correct?so did I?so do I?

I hear Yang Yan made an English speech at the graduation ceremony yesterday.
- So she did, and so did/do I.

There are two errors in the sentence.

It should be I heard Yang Yan make an English speech at the graduation ceremony yesterday.
Hence, the response should be So did I.

tamguatlayIt should be I heard Yang Yan make an English speech

I hear (that) Yang Yan made a speech is possible.

fivejedjon I hear (that) Yang Yan made a speech is possible.

Thank you, I see. So which response is correct? So do I or so did I(if it means "I also hear Yang Yan made a speech")?

'So do I' is grammatically possible, but unnatural. We'd normally say 'I've heard that too'.
;So did I' would mean 'I made a speech too'.

fivejedjon'So do I' is grammatically possible, but unnatural. We's normally say 'I've heard that too'.;So did I' would mean 'I made a speech too'.

Thank you. But judging from the contex, I think the intended meaning is "I've heard that too". So I feel that this test paper question is not well-conceived.

zuotengdazuo I feel that this test paper question is not well-conceived.

It is. The 'so she did' is also unatural

fivejedjon zuotengdazuo I feel that this test paper question is not well-conceived.It is. The 'so she did' is also unatural

Thank you. So how would you revise the original dialogue to make it more natural?

- I hear Yang Yan made an English speech at the graduation ceremony yesterday.
- Yes, she did, and so did I.

zuotengdazuoSo she did, and so did/do I

Concerning "So she did, and so do I", you can't combine those two phrases in that way. You are trying to make "so" mean two different things when you say So she did (make a speech), and so do I (hear that she made a speech). And even if you could do that grammatically, it suggests something logically inco

Thank you for your addendum, Jim.