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QUICK ANSWER
"Ay" is a form of "ay", an interjection which is often translated as "ow". "Qué pesado" is a phrase which is often translated as "how heavy". Learn more about the difference between "ay" and "qué pesado" below.
ay(
ay
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
b. jeez (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Ay! Me asustaste.Jeez! You scared me.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
qué pesado(
keh
peh
-
sah
-
doh
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (how hefty)
a. how heavy
¡Qué pesado es este paquete! ¿Qué habrá dentro?How heavy this parcel is! What can there be inside?
a. how boring
¡Qué pesado es ese hombre! Le encanta sermonear a la gente.How boring he is! He loves lecturing people.
b. how annoying
¡Qué pesado es tener que viajar tanto todos los días para ir a trabajar!How annoying it is to have to commute such a long distance every day!
c. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Acuérdate de cerrar la puerta con llave. - ¡Qué pesado eres! Es la quinta vez que me lo dices.Remember to lock the door. - You're such a pain! It's the fith time you've said it.
¡Qué pesado estás, Carlitos! Estate quieto un rato, anda.What a pest you're being, Carlitos! Can't you keep still for a little while?