Realis moods (abbreviated REAL) are a category of grammatical moods which indicate that something is actually the case (or actually not the case); in other words, the state of which is known. The most common realis mood is the indicative mood, or declarative mood.

In contrast, Irrealis mood are grammatical moods that indicate a statement is untrue or unknown.

The indicative mood or evidential mood (abbreviated IND) is used for factual statements and positive beliefs, for example, "Paul is eating an apple." or "John eats apples." All intentions that a particular language does not categorize as another mood are classified as indicative. It is the most commonly used mood and is found in all languages. [2]

The indicative mood is for statements of actuality or strong probability:

The generic mood is used to generalize about a particular class of things, e.g. in "Rabbits are fast", one is speaking about rabbits in general, rather than about particular fast rabbits. English has no means of morphologically distinguishing generic mood from indicative mood; however, the distinction can easily be understood in context by surrounding words. Compare, for example: rabbits are fast, versus, those rabbits are fast. Use of the demonstrative pronoun those implies specific, particular rabbits, whereas omitting it implies the generic mood simply by default.