1st Conjugation verbs have second principle parts that end in - are . Let's consider the verbs mones and duces Each of these verbs is 2nd Person Singular. That doesn't matter. In this situation, conjugation determines tense.
Latin verbs can be one of six tenses.
Harley was going. Sue will go. Jesus wept . Yesterday I saw a dog, but I had seen one before that. I will have finished my degree before that.