Aorist:
- is the default form to show past time;
 - verbs have an undefined aspect;
 - verbs always take an augment.
 - verbs are further distinguished into first aorists and second aorists.
 
To build an aorist verb you need an:
augment + verb stem + tense formative + verb ending.
Here are the first aorist forms (see BBG chapter 23):
Aorist Indicative:
| Person | Active Voice | Middle Voice | Passive Voice | 
|---|---|---|---|
| 1st Singular | ἔλυσα | ἐλυσάμην | ἐλύθην | 
| 2nd Singular | ἔλυσας | ἐλύσω | ἐλύθης | 
| 3rd Singular | ἔλυσε(ν) | ἐλύσατο | ἐλύθη | 
| 1st Plural | ἐλύσαμεν | ἐλυσάμεθα | ἐλύθημεν | 
| 2nd Plural | ἐλύσατε | ἐλύσασθε | ἐλύθητε | 
| 3rd Plural | ἔλυσαν | ἐλύσαντο | ἐλύθησαν | 
Aorist Imperative:
| Person | Active Imperative | Middle Imperative | Passive Imperative | 
|---|---|---|---|
| 1st Singular | — | — | — | 
| 2nd Singular | λῦσον | λῦσαι | λύθητι | 
| 3rd Singular | λυσάτω | λυσάσθω | λυθήτω | 
| 1st Plural | — | — | — | 
| 2nd Plural | λύσατε | λύσασθε | λύθητε | 
| 3rd Plural | λυσάτωσαν | λυσάσθωσαν | λυθήτωσαν | 
Aorist Subjunctive:
| Person | Active Subjunctive | Middle Subjunctive | Passive Subjunctive | 
|---|---|---|---|
| 1st Singular | λύσω | λύσωμαι | λυθῶ | 
| 2nd Singular | λύσῃς | λύσῃ | λυθῇς | 
| 3rd Singular | λύσῃ | λύσηται | λυθῇ | 
| 1st Plural | λύσωμεν | λυσώμεθα | λυθῶμεν | 
| 2nd Plural | λύσητε | λύσησθε | λυθῆτε | 
| 3rd Plural | λύσωσι(ν) | λύσωνται | λυθῶσι(ν) | 
See also the aorist passive and a gnomic aorist.