Question

in the preterite the "yo" form of -car ending verbs changes to a?

Answer 1

In the preterite tense, the "yo" form of -car ending verbs changes the "c" to "qu" before the "é." For example, the verb "buscar" (to search) in the preterite first person singular is "busqué." Similarly, "tocar" (to touch) becomes "toqué."

This change occurs to maintain the correct pronunciation of the sound when the ending "-é" is added.