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"Tú" is a form of "tú", a pronoun which is often translated as "you". "Nunca" is an adverb which is often translated as "never". Learn more about the difference between "tú" and "nunca" below.
tú()
A pronoun is a word that stands in for a noun (e.g., she).
1. (informal) (second person singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
nunca()
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
1. (not ever)
b. ever (after "not")
Nunca llegas a tiempo.You don't ever arrive on time.
¿Vives en México y nunca has comido tacos?You live in Mexico and you haven't ever eaten tacos?