Time cools, time clarifies; no mood can be maintained quite unaltered through the course of hours. - Mark Twain

Verbs can indicate intention by being placed in the indicative, imperative or subjunctive mood.

Mood - Also called mode - A set of verb forms or inflections used to indicate the speaker’s attitude toward the factuality or likelihood of the action or condition expressed.

Indicative - The mood of the verb used in ordinary objective statements. The indicative mood is used to make factual statements.

Imperative - Something that demands attention or action; an unavoidable obligation or requirement; necessity. The imperative mood is used to express a command.

Subjunctive - Subjective, doubtful, hypothetical, or grammatically subordinate statements or questions. The subjunctive mood is used to indicate doubt or unlikelihood.

Subjunctive Forms

Unexpected verb forms that express matters not present or past in the usual sense are called subjunctive mood. They make things urgent, formal, possible or unreal.

Subjective Mood - Form of a verb which express the action or state not as a fact, but only as a conception of the mind still contingent and dependent. It is commonly subjoined, or added as subordinate, to some other verb.