Example image of eyePlorer eyePlorer map for 'Germanic strong verb': Indo-European ablaut Germanic weak verb Jacob Grimm Strong inflection Dutch language English language German language Old Dutch Old English Old High German West Germanic languages Germanic verb Principal parts Proto-Indo-European language Germanic umlaut Metaphony Germanic a-mutation Diphthong Laryngeal theory Gothic language Henry Sweet Grammatischer Wechsel Verner's law Vowel breaking Vowel length Preterite-present verb Limburgish Indo-European copula Dutch orthography Proto-Germanic Reduplication Old Norse East Germanic strong verb List of English irregular verbs Broken plural Synchronic analysis English conjugation tables Germanic languages Theo Vennemann Irregular verb Germanic spirant law Swedish as a foreign language English irregular verbs Jutlandic Strong Strong verb Regular verb Apophony Darkness English verbs