Verb is the most important word in a sentence which expresses an action or state. In Portuguese verbs are conjugated to different forms in different tenses and in different persons of the noun using it.

Portuguese verbs may be classified in two groups regular and irregular.

Usually the verbs ending with -ar, -er and -ir have regular forms when conjugated. This means all verbs ending -ar have fixed forms in different tenses and persons. So is in the case of verbs ending with -er and -ir. Such verbs are also termed as ar, er and ir verbs.