Question

Should we say
"It is I who say so." or
"It is I who says so."?

Answer 1

I believe the second is more accurate.. Never thought about it much but it sounds right :o

Answer 2

But the "who" clause is an attibute modifying "I", so shouldn't the verb agree with the first person "I"? Also, in one grammar book, it has an example sentence:"It is I who want money."

Answer 3

Lol, then go with your grammar book. Now, I'm going to have to look it up o.O

Answer 4

The correct version is the sentence with "who says so" - because I say so! ;)

Simply put, "who" is the subject of "says", which is the verb used with singular subjects, with the exception of the subject "I" (again, because "I" say so)-

The plural verb "say" following "who" is correct in archaic use only, as in " Who say thou art righteous?"

Also of note:

"who says so" > adjective phrase beginning with the relative pronoun "who" ; this phrase is an adjective phrase because it descibes "I"

"I" > acting as a predicate nominative of "It is I", because "I" renames the subject "it"

Answer 5

It's the second one .

Answer 6

The second is more accurate.
The first one may sound correct, but the second one is a better choice.

Answer 7

x: "get out y"
y: now, who said that?
x: it is i who say so!
z: who wants y to go out?
y: it is x who says so!!