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"Conviertan" is a form of "convertir", a transitive verb which is often translated as "to turn into". "Tengan" is a form of "tengan", a phrase which is often translated as "have". Learn more about the difference between "conviertan" and "tengan" below.
convertir(
kohm
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behr
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teer
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
b. to change into
El trabajo lo había convertido en un hombre aburrido.Work had changed him into a boring man.
a. to convert
Los misioneros convirtieron al catolicismo a muchos nativos en África.The missionaries converted many natives in Africa to Catholicism.
5. (sports)
a. to score (in soccer and basketball)
El jugador convirtió el penal.The player scored the penalty kick.
b. to convert (in American football and rugby)
Convirtió el ensayo y anotó dos puntos más para su equipo.He converted the try and scored two extra points for his team.
convertirse
A pronominal verb always uses a reflexive pronoun. (e.g., Te ves cansado.).
b. to turn into
El pueblecito de pescadores se ha convertido en un lugar turístico.The small fishing village has turned into a tourist resort.
a. to convert to
Me convertí al judaísmo para casarme con mi amada.I converted to Judaism to marry my love.
tengan
A phrase is a group of words commonly used together (e.g., once upon a time).
a. have
Tengan efectivo encima; algunos sitios pueden no aceptar tarjetas de crédito.Have some cash on you; some places may not accept credit cards.