In Spanish, the gerund (present participle) corresponds to the English "-ing" form (e.g., working, eating). While regular -er and -ir verbs typically use the ending -iendo, verbs with a stem ending in a vowel undergo a spelling change to facilitate pronunciation.
When the stem of an -er or -ir verb ends in a vowel, adding -iendo would place an unaccented "i" between two vowels (e.g., le-iendo). In Spanish spelling rules, an unaccented "i" between two vowels changes to a "y".
Formula: Stem ending in vowel + -yendo
These are high-frequency verbs where the stem ends in a, e, or o.
Verbs ending in -uir also follow this pattern because the "u" acts as the final vowel of the stem.
You use these forms exactly the same way as regular gerunds, primarily with the verb estar to form the progressive tenses.
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