Category:Quirk class 4 C

The sub-class of category:Quirk class 4 in which all three parts (the base form, the past tense and the past participle have different vowels. There are three sub-classes:

• In 4 C a, the best-known verbs are probaly write and drive, which change vowels in the pattern IPA: /aɪ ~ əʊ ~ ɪ/ ('write~ wrote ~ written'). The seven verbs in this category are 'drive', 'ride', rise', 'smite', 'stride', 'strive' and 'write'.
• 4 C b has one verb, fly)
• 4 C c only has do.