Example image of eyePlorer eyePlorer map for 'English irregular verbs': English language Irregular verb Participle Past tense Defective verb Old English Steven Pinker Words and Rules Great Vowel Shift Proto-Germanic Proto-Indo-European language German language Germanic strong verb Weak inflection Vowel Germanic umlaut Germanic weak verb Preterite-present verb Perfect tense Present tense Auxiliary verb Modal verb Suppletion Copula (linguistics) Go (verb) Indo-European copula English orthography Analogy Contraction (grammar) Principal parts English verbs English grammar