these seem to me to be the 'doING, and the dONE forms
These are called imiesłowy in Polish - imiesłów czynny (-ący) and imiesłów bierny (-ny).
Example: widzieć - widzący - widziany
Differently than the forms - ing and -ed in English, these are not used to form tenses.
Examples of use:
człowiek idący po drugiej stronie ulicy - the man (who is) walking on the other side of the street
list napisany po angielsku - a letter written in English - this one is used to form passive voice. But passive voice in Polish is less common than in English.
present active,present passivepast passive
present active - ja piszę list - I am writing a letter
present passive - list jest pisany - the letter is being written
past passive - list był pisany - the letter was written
but what is the frequentative miewam
mam - I have something (now)
miewam - I have something sometimes, now and again, not in a continuous manner
Example: Miewam czasem bóle głowy - I have headaches now and again.
But you may also say: mam czasem bóle głowy.