Verbs
The base form of the Portuguese verb is called “infinitivo” (infinitive). All infinitive verbs end in “–ar”, “-er”, “-ir” (and "-or", which is present in a single verb, "por" - to put). Once you take out the infinitive ending, you're left with the radical (stem), which is the element of the verb that possesses the meaning. The verbs change their endings according to the person (first, second, third); tense (present, preterite, imperfect, pluperfect, future, and conditional) and mood (indicative, subjunctive, imperative) they refer to, while other verbs (called as irregular verbs) even change their roots.
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