There are four ways verbs take an augment:
- The normal, expected way is if the verb begins with a consonant, then the augment is an epsilon prefix as above.
- If the verb begins with a single vowel, the augment is formed by lengthening that vowel (α to η, ε to η, ο to ω).
- If the verb begins with a dipthong, either the first letter of the dipthong lengthens (ευχαριστεω ηυχαριστουν), or the dipthong is not changed at all (ευρισκω ευρισκον).
- In compound verbs, the augment will slide in directly between the preposition and the verb (καταλαμβανω to κατελαβεν).
Augments only occur in the indicative (principle 13).