Pablo es serio
Serio being singular and the correct masculine adjective.
Answer:
Explanation: The levels of language are the registers used to speak or write, they are the following: popular, colloquial, formal, vulgar and cult. Here is a short dialogue using the language levels:
María: Hello, Santiago, I have missed you very much.
Santiago: Hello Maria, if you knew how much I have missed you too, tell me, what have you done?
María: Working with you Luisa, and you?
