They are, however, mainly regular changes, like those in the weak verbs.
The effect has an important consequence for some of the oldest weak verbs.
The first and third person of the past tense are identical (as in weak verbs).
The vast majority of weak verbs are secondary, or derived.
There are three major classes of weak verbs in Old English.
Weak verbs which develop strong forms are often unstable.
"Weak verbs" have a preterite form that is the same as their aoriste.
The past participles of weak verbs decline as strong adjectives.
Generally, the above rules for weak verbs apply in combination, as long as they do not conflict.
In the past tense, they use the preterite endings of the weak verbs.