"No tiene un gato" is a correct sentence. But it needs context as it can be translated 3 ways. Here are the ways with their identifying pronouns:
Él no tiene un gato. - He does not have a cat.
Ella no tiene un gato. - She does not have a cat.
Usted no tiene un gato. - You [formal] do not have a cat.
It means do you have or does it contain.
"Me gusta gato hombre" translates to "I like cat man" in English.
Tiene
The Spanish sentence "¿Quién tiene el sombrero?" translates to "Who has the hat?" in English. It is a question asking about the person who possesses or is in control of the hat.
"Gato" is a Spanish and Portuguese word for Cat.The cat
Él tiene means: he has. It is phrase and not a complete sentence.
You(polite, singular)/he/she/it does not have
"i" its the past tense for the verb tiene "to have"
Usted tiene is a sentence fragment that means "you have". This is a formal statement. When speaking informally the fragment would be "Tú tienes"
Means "My cat has the biggest balls" PELOTUDO DE MIERDA xD
"tiene siete dias" means "has seven days"
"Que tiene" in Spanish translated to "what he/she/it has/you have" "Tiene" is the he/she/it/you(formal) conjugation of the Spanish verb "tener" which means "to have", therefore "tiene" means "he, she or it has/you have" "Que" can either mean "what" or "that" "Que tiene?" as a question means "What does he/she/it/you have?" "....que tiene" in the middle of a sentence usually means "that/which he/she/it has/you have". 'tener que' = 'to be obliged/have to' 'que tiene que' = 'which/who is/are obliged//has/have to'