When a verb is irregular in a specific tense, say the present or the preterite, that doesn't mean that their gerund is also irregular. It may be, it may not be.
For example, verb estar is irregular in the present and the preterite "estoy", "estuve"... but its gerund form is regular "estando".
However here is a lesson on irregularities in the gerund that will definitely help you.
Have a look:
I hope this helps
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