A verb expresses action or being. There is a main verb and sometimes one or more helping verbs.

She can sing.

In the example above, sing is the main verb; can is the helping verb.

The verb is a part of speech that denotes an action. The verb has the following grammatical categories: person, number, tense, aspect, voice, and mood. These categories can be expressed by means of affixes, inner flexion (change of the root vowel), and by form words.

Verbs may be transitive and intransitive.

Verbs have finite forms which can be used as the predicate of a sentence and non-finite forms which cannot be used as the predicate of a sentence.

A verb must agree with its subject in number (both are singular or both are plural). Verbs also take different forms to express tense.

The young girl brought me a very long letter from the teacher, and then she quickly disappeared.