I believe it would be, “¿Sabías que todos los huracanes tienen nombre?”
Step-by-step explanation:
this is because you’re conjugating the verb saber to match the tú. the suffix for an -er verb in the imperfect tense that matches this subject would be “-ías”
• take the infinitive or “raw” form of saber
saber
•drop the ending of -er
sab-
• add the appropriate suffix that matches the subject pronoun and is in imperfect tense :)
you get “sabías”!
i am not a native spanish speaker nor am i completely fluent. just a student, so there’s a chance i made an error as i’m basing this off my own understanding of the imperfect tense. regardless i hope this helps!! buena suerte :)