I used a deductive approach to learn Greek verbs. Personally, memorisation is hard and this approach reduced the load on my memory while helping me to more quickly parse. I thought of it as "rules" combined with some memorisation, not wholly memorisation.
The basic “rules” were:
- Verb morphology is <stem> + <ending>
- Verb endings fall into one of four-quadrants: primary+active, primary+middle/passive, secondary+active, secondary+middle/passive.
- The six tense-forms were categorised as using primary or secondary endings.
- The six tense-forms in the indicative each have their own morphology. E.g., the present (<present tense stem> + <ending>), imperfect (<augment> + <present tense stem> + <ending>), future (<root> + <tense-formative> + <ending> with three “gotchas”, one on root, one on the tense formative and another for the passive tense formative) etc..
- Then also the morphology for the other moods, which had their own variations.
Now a verb could be identified or produced (e.g. for paradigms) based on (1) its morphology and (2) its ending. I memorised the quadrant of endings (with
song or
mnemonics) and learnt the morphology.
Decker's "Reading Koine Greek" was helpful for this approach.