Assertion: verb's vowel | /r/CapableOf | undergo breaking to diphthong
Facets:
value: in the infinitive
type: LOCATION
value: in first preterite forms
type: OTHER
Source sentences:
text: In Class IIIb verbs, the vowel was followed by an h or r, and so underwent breaking to a diphthong in the infinitive and first preterite forms.