Subjunctive mood

The indicative mood is the "mood of reality" used to state facts. By contrast the subjunctive mood is the mood of contingency or possibility, it is used to state what might happen.

Present

 * present tense stem
 * lengthened of connecting vowel: ο->ω, ε->η, ει->ῃ
 * primary endings (active or middle as appropriate)

Aorist

 * No augment! - because it doesn't connote past time
 * 1st Aorist - plain old present tense stem + sigma formative
 * 2nd Aorist - the different aorist tense stem, sigma formative typically not visible
 * primary endings! - so it is different from aorist indicative
 * may look like a future indicative, but there's no such thing as future subjunctive

Example Paradigms
Because of the lengthened connecting vowels, the subjunctives are usually easily identified by the omega or eta or eta and iota subscript.

With contract verbs, the lengthened connecting vowels may not be visible after contraction.