exonie: # jeść/jadać/zjeść/zjadać
this rather a grammar issue
jeść><zjeść the former is imperfective the latter perfective (simple non prefixed forms are typically imperfective but it's not an iron rule and there are imperfective verbs that have your typical prefixes (the prefixes are usually prepositions sometimes altered a bit)
if you haven't been taught what imperfective and perfective are then perfective is used when an action has been finished, completed, or just ended or is supposed to be finished in the future - as such perfective is never a thing of the now - so no perfective forms in the present tense
as you probably guess imperfective is simply more generic thing without determining if the action or the process have been completed - all verbs in the present tense are imperfective - if you want to say that some to actions or process is going to happen (or happened) simultanously with another the one (the longer) that you relate to is going to be in imperfective (Marek zadzwonił jak jedliśmy z mamą obiad. Marek phoned when/as we were dining with mum)
sometimes differences are nuancical though
jadłem obiad - I was having a dinner zjadłem obiad - I had a dinner (but it's not that clearcut in actual use and you can often hear 'Jadłeś (już) obiad?' in a sense of 'Have you (already) had your dinner'
now a the issue of the so called frequentative
frequentative is a form of a verb that is used to show something happens in a repeated manner, typically, numerous times, from time to time - it can be very roughly explained as a difference between the English present simple and present continuous (very roughly because it is not always the case) - there are more or less strict rules how frequentatives are created in Polish (you have to take into account phonetical laws and irregularities of major verbs that spring from frequent use)
jem - I am eating jadam - I eat
jem śniadanie - I am having a breakfast śniadania jadam o szóstej - I have breakfast at six
(the thing is 'jem' can be often used instead of 'jadam' and definitely in this case - however 'jadam' cannot be used to mean 'i am eating')
the frequentative can be created (typically) equally from a perfective or imperfective verb (verb form) - so you've got 'jeść - jadać' but also 'zjeść- zjadać'
the thing is a frequentative of a given form is always imperfective (however a further perfective can be created of that imperfective frequentative with a prefix (pozjadać)) - so zjadać is imperfective an can be used in the present tense
Właśnie zjadam ślimaka - I am eating a snail right now (rather than I am having a snail right now) - but again 'jem' can be used here instead of 'zjadam' (as a form with a more general meaning)
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