已然语气(realis moods、现实式/实现状/实然/现在、完成、习惯及进行与过去式)是用于表明事情为实际情况（实际是怎样或实际不是怎样；已经发生或正在发生的事件）一类语气；亦即，用于表明事情的状况为已知的一类语气。最常见的已然语气为"直陈语气"或"宣告语气"。因为并不是每种语言都有已然语气下的子类别，所以在有些语言中，已然语气等于"指示语气"(indicative mood) ，因而在中文中，常有混用译名的情况。

A realis mood is a grammatical mood which is used principally to indicate that something is a statement of fact; in other words, to express what the speaker considers to be a known state of affairs, as in declarative sentences. Most languages have a single realis mood called the indicative mood, although some languages have additional realis moods, for example to express different levels of certainty. By contrast, an irrealis mood is used to express something that is not known to be the case in reality.