Assertion: tense's form | /r/CapableOf | show change of valency
Facets:
Source sentences:
text: Some verbs in English, however, have historically derived forms that show change of valency in some causative verbs, such as fall-fell-fallen:fell-felled-felled; rise-rose-risen:raise-raised-raised; cost-cost-cost:cost-costed-costed.