"Who saw you" changes to "I don't know~"

I’m learning about question sentences.

I saw the example in my text book.

Where has Tom gone? -> Do you know where Tom has gone?

I understood it.

but if changes this sentences to “Do you know~”

Who saw you? -> Do you know who _____ ?

Is it correct that “Do you know who saw you?”

Your last sentence looks correct to me.

Thank you so much :slight_smile:

Recently caught overthinking it, still would a native go for smth like ‘Do you know who’s seen you\ Do you know who was seeing you’?

Hi Bangong,

Just to add - in your last sentence ‘who’ still remains the subject in ‘who saw you.’