Como dizer "Flexionar (verbo)" em inglês

Hi Simon

To inflect

In languages where the verb is inflected, it often agrees with its primary argument (the subject) in person, number and/or gender. With the exception of the verb to be, English shows distinctive agreement only in the third person singular, present tense form of verbs, which is marked by adding "-s" (I walk, he walks) or "-es" (he fishes). The rest of the persons are not distinguished in the verb (I walk, you walk, they walk, etc.).
(Wikipedia)

How is the verb "run" inflected in past tense?

Also, to conjugate.

One conjugates the present tense of the verb “be” as “I am, you are, he is, we are, you are, they are.”