"We have asked them if we can listen to music."
Translation:Zapytaliśmy ich czy możemy słuchać muzyki.
Zapytaliśmy je is for a group of only female people. Zapytaliśmy ich is for group that had at least one male person.
they can be translated as oni, or one
oni is for groups that include at least one male person
one is for group of female people, children , also for all plural feminine and neuter nouns, and plural masculine nouns that do not describe people.
if you look at any declension or conjunction chart it will show you either masculine personal/ not masculine personal or masculine personal/other forms.
ich - in this sentence is accusative form of oni je - is accusative form of one ją - would be accusative form of ona (she/her)
In the form of the question where you pick available words rather than enter them freeform, there will likely be only one of the combinations available to pick. This doesn't mean that the other combination is incorrect, it's just that there aren't enough words available in the pick list to have both. In my case it was only the Virile combination (at least one male person) that was in the list.
As Jellei stated, there is no set way to find the matching perfective verb from the imperfective. For many verbs, it is a prefix such as na-, po-, za-, prze-, s-, z-, u-, wy- that when attached to the imperfective verb become the perfective. There is no way to my knowledge as a Polish learner to predict which suffix goes with which verb, you simply must memorize it for every verb. Other perfective verbs look similar to their matching imperfective verb but the latter part of the word differs, such as: kupować/kupić, zamykać/zamknąć, dawać/dać, pomagać/pomóc, or wracać/wrócić. In many of those cases one is longer than the other and if so, I've found that the longer one is almost always the imperfective. But in which specific way any particular perfective verb differs from the imperfective for these is entirely unpredictable. Again, you need to memorize each verb. Finally, there are a few imperfective and perfective verb pairs that look nothing like each other. Examples are: widzieć/zobaczyć and brać/wziąć. Once again, there is no pattern or way of knowing which verbs are like this. Memorize each one: that's the only pattern I'm aware of ;-)