Is this term an irregular verb where the past and past participle conjugations follow some odd rule?

A verb is irregular when the past and past participle conjugations are different.

Verb Conjugation Rules.

1. Past tense: add –d, -ed, or –t to end of verb
   • For verbs ending in –y change –y to -i and add –ed
   • Examples: log – logged, bend – bent, lobby – lobbied
2. Past participle: add -d or –ed or –t to end of verb
   • For verbs ending in –y change –y to -i and add –ed
   • Examples: Examples: log – logged, bend – bent, lobby – lobbied
3. Present Participle: add -ing to end of verb
   • For verbs ending in –e remove –e before adding –ing. This rule excludes verbs ending in –ee. Verbs ending in –ee follow normal convention of adding –ing to the end.
   • Examples: log – logging, brake – braking, flee – fleeing
4. Third Person: add -s or -es to end of verb
   • For verbs ending in –y change –y to -i and add –es
   • Examples: log – logs, lobby – lobbies, catch – catches

Irregular Verb Examples