Allen and Greenough's New Latin Grammar, section 154

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Voice, Mood, Tense, Person, Number.

154.

Through its conjugation the Verb expresses Voice, Mood Tense, Person, and Number.

a. The Voices are two: Active and Passive.

b. The Moods are four: Indicative, Subjunctive, Imperative, and Infinitive.[1][The Infinitive is strictly the locative case of an abstract noun, expressing the action of the verb (§ 451).]

NOTE: The Indicative, Subjunctive, and Imperative are called Finite Moods [QUERY] distinction from the Infinitive.

c. The Tenses are six, viz.: -

1. For continued action, Present, Imperfect, Future.
2. For completed action, Perfect, Pluperfect, Future Perfect.

The Indicative Mood has all six tenses, but the Subjunctive has n[QUERY] future or future perfect, and the Imperative has only the present and the future. The Infinitive has the present, perfect, and future.

d. The Persons are three: First, Second, and Third.

e. The Numbers are two: Singular and Plural.