Read the following sentence and choose the verb tense that should be used to translate it to spanish.
i met the mayor of the city
preterit tense for a completed action
imperfect tense for a description

preterite tense: Conocí al alcalde de la ciudad.

Explanation:

In this case the preterite tense is used because meeting the mayor of the city was a one-time action. The sentence above is the direct translation of I met the mayor of the city. The verb conocer is conjugated in the first person preterite tense to reflect this event.

The imperfect form of conocer is used to describe things that someone already knew how to do or was already familiar with at some time in the past.

corras is the only one that is informal but doesn't follow the suffix rule. correr is the verb. corre is the formal verb form. corra would be used as the formal is corre ended with an a.

your best bet would be corras, it's the only one that is informal but is still wrong