These verbs are taken from New Testament Greek for Beginners, by J. Gresham Machen. I have ordered them according to the classification of stem type (as in William Mounce's The morphology of Biblical Greek).

Principal parts of verbs organized by type of verb stem (pdf version) (postscript version)

In case anyone is interested, here are the same words ordered in different ways:

• Principal parts of verbs ordered alphabetically (pdf version) (postscript version)
• Principal parts of verbs ordered by lesson number in Machen's book. (pdf version) (postscript version)