If I want to ask the question about the dog, whose name is Cerberus
should I ask
Quis est Cerberus?
or
Quid est Cerberus?
Do we use quis
or quae
(according to gender) about animals or quid
?
What is the rule here?
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Sign up to join this communityIf I want to ask the question about the dog, whose name is Cerberus
should I ask
Quis est Cerberus?
or
Quid est Cerberus?
Do we use quis
or quae
(according to gender) about animals or quid
?
What is the rule here?
Welcome to the Latin Stack Exchange!
If you are asking "who" Cerberus is, then Quis is correct since Cerberus is male. If you want to know "what" Cerberus is, then Quid is correct.
Quis and quid are both grammatical here, but mean different things.
"Quid" is a pronoun meaning "what", and can be used that way even in a sentence with a masculine, feminine or plural subject:
Some examples:
Ipsi enim quid sumus aut quam diu haec curaturi sumus?
(Cicero, Epistulae ad Atticum 12.11.1.1)
Quid est enim exsul?
(Cicero, De Domo Sua 72.3)
So if you mean to ask "What is Cerberus?"/"Cerberus is what?", you can say "Quid est Cerberus?"
"Quis" means "who", so if you mean to ask "Who is Cerberus?", you can say "Quis est Cerberus".
Compare English: "What is Cerberus" and "Who is Cerberus" are both valid sentences; they just mean different things.
Of course, Latin is not English. But similarly, compare the use in Latin of id vs. is: I believe id est Cerberus and is est Cerberus are both grammatically valid. Since a demonstrative pronoun like is/id does not have to agree with the gender of the other noun in copular construction, I don't think the interrogative pronoun quis/quid has to agree in this construction either.
In terms of grammatical resources, here are some reddit posts I found:
Also the questions listed in this handout "Developing oral skills in Latin", from the website of the New York State Education Department, show usage of quid vs. quis according to the meaning of the pronoun, not in agreement with the other noun in the sentence:
Ask the following questions
Teacher: Quid est Campus Martius?
Student: est locus
[...]
Teacher: Nunc quid est Spartacus?
Student: gladiator
Other alternative interrogative pronouns: