The infinitive (the standard version of the verb - as it is seen in the dictionary), takes different forms in the present, known as conjugations, depending on who is performing the action expressed by the verb:
Ich gehe zum Park. I go to the park.
Du gehst zum Park. You go to the park.
Wir gehen zum Park. We go to the park.
In the chart below, the regular endings of the German present tense can be seen: