The English equivalent of the Spanish verb "llamar" depends on the context in which it is used. Here are the possible translations for the given contexts:
"Gracias por llamar." - "Thank you for calling."
"O to talk" - The verb "llamar" can also mean "to talk," but it is typically used in the context of talking on the phone. For example, you could say "Voy a llamar a mi madre" (I'm going to call my mother).
"O to invite" - The verb "llamar" can also mean "to invite," but it is typically used in the context of inviting someone to an event. For example, you could say "Te llamo para invitarte a mi fiesta" (I'm calling you to invite you to my party).
"O to call" - This is the most common translation of "llamar." It can be used in a variety of contexts, including calling someone on the phone, calling out to someone, or summoning someone.
"O to respond" - The verb "llamar" can also mean "to respond," but it is typically used in the context of responding to a question or request. For example, you could say "No puedo llamar a tu pregunta" (I can't answer your question).
I hope this helps!