When verbs are conjugated in the present tense they have these changes in the root, therefore it is important to identify the person, the number and gender in each sentence to conjugate them correctly and that they have agreement with what is being expressed.
Identifying the narrator and the time that a sentence indicates is the first step that must be taken. this is very important to be able to logically conjugate the verbs, and that these have concordance with what is being expressed