Polish/Exercises - Introductory conjugation

There are many irregular and semi-irregular Polish verbs, but among the others, we can find some regularities - and we can divide them into four categories.

Verb "być" is irregular, it doesn't fit in any of these groups.

NOTE: The first example in each table is a perfective verb (when the action is complete), while the second one is an imperfective one (the action is in progress); the endings are the same, but the imperfective verbs have an extra syllable added between the verb root and the conjugated verb ending, as shown below.

Ist group: -ę, -esz

IInd group: -ę, -isz (-ysz)

IIIrd group: -am, -asz

IVth group: -em, -esz