Question

What is the yo form of the verb desayunar in the present perfect tense?

Answer 1

Desayunar conjugated into the yo form- "Yo desayuno"

Answer 2

The first person form of the verb desayunar in the present perfect tense is "He desayunado."

To conjugate a word into the present perfect tense, use Haber (present) + Past participle.
So, when conjugating desayunar into the present perfect tense, add He and replace the -ar ending with -ado.