Hi thaliafan
Basically, in Polish there'ra at least a few patterns of verbs conjugation (speaking about present tense OC, it's an equivalent of Present Continuous, Simple Present and sometimes Present Perfect (Continuous) in English language):
W formach
czasu teraźniejszego wyróżniamy następujący szereg końcówek (the endings of present tense are as follow):
w liczbie pojedynczej (singular):
1. osoba -m lub -ę (umiem, piszę)
2. osoba -sz (umiesz, piszesz)
3. osoba -Ø (umie, pisze)
w liczbie mnogiej (plural):
1. osoba -my (umiemy, piszemy)
2. osoba -cie (umiecie, piszecie)
3. osoba -ą (umieją, piszą)
Note that the above mentioned rules are really general and reffer only to regular verbs since there're many irregular ones (sometimes it seems to me that there are even more of them than the regular ones

). Furthermore, there's no differentiation in present tense between persons, the endings are the same for every form (masculine, femine, neutral and virrile or non-virile) and sometimes present tense serves as future one as well.
Checking, the Dictionary of Propper Polish Language I may say that there're 11 patterns of verb conjugation (some of them divide into groups), you may find them at these links (the content is in Polish):
I ~
II ~
III ~
IV ~
Va ~
Vb ~
Vc ~
VIa ~
VIb ~
VIIa ~
VIIb ~
VIIIa ~
VIIIb ~
IX ~
Xa ~
Xb ~
Xc ~
XI