Many intransitive verbs, however, can be used transitively; thus, "I walk the horse;" walk is here transitive.
Verbs are inflected by number, person, tense and mood.
Number and person as applied to the verb really belong to the subject; they are used with the verb to denote whether the assertion is made regarding one or more than one and whether it is made in reference to the person speaking, the person spoken to or the person or thing spoken about.
TENSE
In their tenses verbs follow the divisions of time. They have present tense, past tense and future tense with their variations to express the exact time of action as to an event happening, having happened or yet to happen.
MOOD
There are four simple moods,—the Infinitive, the Indicative, the Imperative and the Subjunctive.
The Mood of a verb denotes the mode or manner in which it is used. Thus if it is used in its widest sense without reference to person or number, time or place, it is in the Infinitive Mood; as "To run." Here we are not told who does the running, when it is done, where it is done or anything about it.
When a verb is used to indicate or declare or ask a simple question or make any direct statement, it is in the Indicative Mood. "The boy loves his book." Here a direct statement is made concerning the boy. "Have you a pin?" Here a simple question is asked which calls for an answer.
When the verb is used to express a command or entreaty it is in the Imperative Mood as, "Go away." "Give me a penny."