What you have said are correct

[Rickyrocky]

What you have said are correct.
vs.
What you have said is correct.

Which is wrong and why?
Thanks.

[Mister Micawber]

'Is'. 'What' is singular as a subject.
_________________
Native English teacher at Mister Micawber's

[Rickyrocky]

But can I refer to many things that he/she have said?

What if I wanted to refer to a few things he/she said?

[Alan]

Hi Rickyrocky,

'What' (in your sentence) refers to the total of everything that has been said. It doesn't matter how much is contained within the total. For example you could hear a list of things said by someone and you don't remember exactly the things that were said. You would then ask: Can you tell me exactly what was said?

Alan
_________________
English as a Second Language
You can read my ESL story Present Simple

[Beeesneees]

he/she has said.

If you want to refer to a number of things then you cannot use 'what'.
The things you have said are correct.
_________________
Cheers m' dears!

[Rickyrocky]

I see. Thank you all for the detailed explanation.