Language / iec conjugation [47]

I think you must understand that there are many things in Polish that are just exceptions and it's far better to learn the declension by heart than apply some rules, which are hardly understandable. (at least the one you quoted)

'Jeść' is one of the essential verbs so first - there is a great chance it won't be regular, second - learning the declension by heart will really come in handy :)

But OK, let's try another one:

nieść
niosę - present, 1st person singular
niosłam - present, 1st person singular fem. imperfective
zaniosłam - present, 1st person singular fem. perfective

that's kind of as they say, but it's silly. /s/ is in all the forms. Now why shouldn't it?