In Spanish the gerund (the -ing verb form in English) is formed by taking the stem of the verb (e.g hablar → habl-) and adding one of these endings:
-ando (for -ar verbs)
-iendo (for -er/-ir verbs)
However there are some verbs that have irregular gerunds:
1. Verbs ending in -er and -ir with a double vowel in the stem.
Notice how the ending is -yendo, not -iendo.
Another special case with a -yendo ending is verb ir (to go)
Ir → yendo
To go → going
2. Some verbs with an e > i or e > ie stem change in El Presente swap the -e in the infinitive for an -i, however the ending remain regular:
3. Some verbs with an o > ue stem change in El Presente swap the -o of the infinitive for an -u, however the ending remain regular:
4. -ir verbs that undergo a vowel change (e > i) and have an -e immediately before the -ir lose the -e from the stem.
See also Forming regular gerunds (-ing form) .
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