To encourage your son to sound out words he doesn’t know, help him build confidence blending and segmenting words. For example, you might start by having him listen to you stretch out the two-sound word “me” (e.g., m-ē).
Look at the pictures. Draw lines from the cold things to the Spanish word for cold, frío. Draw lines from the hot things to the Spanish word for hot, caliente. Then play Caliente y Frío (Hot and Cold) with a friend!