Here's why:
* "Tu" is the informal second-person singular pronoun (you).
* "Tengo" means "I have" and is the first-person singular conjugation of the verb "tener" (to have).
You cannot combine "tu" and "tengo" because they refer to different subjects.
Possible Correct Phrases:
* "Yo tengo": "I have" (correct way to say "I have" in Spanish)
* "Tú tienes": "You have" (correct way to say "you have" in Spanish, informal)
* "Usted tiene": "You have" (correct way to say "you have" in Spanish, formal)
Let me know if you'd like to translate a different phrase!