What is an Irregular Verb?
Irregular Past Tense Patterns, V1/V2/V3 Forms, Examples & Verb Lists
An irregular verb is a verb that forms its simple past tense (V2) and past participle (V3) through internal vowel shifts, consonant changes, or unchanging roots rather than adding the standard -ed or -d suffix (e.g., sing / sang / sung, write / wrote / written, go / went / gone).
English irregular verbs look chaotic until you realize that words like sing, sang, sung and drive, drove, driven aren't broken rules at all, but the surviving remnants of an older Germanic vowel-shifting system that everyday speakers used too often to ever let fade away. Below, we group irregular past tense verbs into four recognizable sound families, explain how V1, V2, and V3 forms work, and provide an interactive irregular verbs list.
• Table of Contents
• Understanding Irregular Verbs & Old English Ablaut
In Old English, "strong verbs" signaled past time through a phonological process called ablaut, which stepped the root vowel through a predictable sequence (such as i → a → u in sing, sang, sung or begin, began, begun). Over the centuries, as English borrowed thousands of French and Latin words, speakers defaulted to the simpler "weak verb" -ed ending for newcomers. Less common strong verbs like help (which once formed holp in the past tense) eventually regularized into helped, while the roughly 200 irregular verbs left today survived because parents and children spoke them too many times an hour for their historical forms to be forgotten.
Modern English verbs split into three structural behaviors when shifting into the past tense:
Weak (Regular) Verbs
Add a dental suffix (-ed or -d) to the base stem for both the simple past and the past participle.
Strong (Vowel-Shift) Verbs
Shift their internal root vowel through inherited Germanic gradation and often append -en or -n in the participle.
Invariant Root Verbs
Short verbs ending in -t or -d whose historical dental endings fused into the root, leaving V1, V2, and V3 identical.
• See it in Context
Many irregular verbs preserve distinct forms for the standalone simple past (V2) and the auxiliary-paired past participle (V3). Click through the verb forms below to see how shifting between V2 and V3 alters the timeline and register of the sentence.
• The 4 Patterns of Irregular Past Tense Verbs
Memorizing irregular verbs alphabetically forces your brain to treat related sound changes as isolated accidents. Grouping them into four structural families lets you learn dozens of conjugations at once by ear.
Group 1: Invariant Roots (V1 = V2 = V3)
All three principal parts share the exact same spelling and pronunciation.
- put → put → put
- let → let → let
- cost → cost → cost
Group 2: Shared Past & Participle (V2 = V3)
The simple past and the past participle match each other while differing from the base verb.
- buy → bought → bought
- catch → caught → caught
- feel → felt → felt
Group 3: Base & Participle Match (V1 = V3)
The verb shifts its vowel in the simple past (V2) but returns to its original root spelling in the past participle (V3).
- run → ran → run
- come → came → come
- become → became → become
Group 4: Three Distinct Forms (V1 ≠ V2 ≠ V3)
Classic Germanic strong verbs where the base, simple past, and past participle are all distinct.
- drive → drove → driven
- sing → sang → sung
- eat → ate → eaten
• The V1, V2, V3 System Explained
Conjugation tables organize irregular verbs into three principal parts labeled V1 (Base Form), V2 (Simple Past), and V3 (Past Participle). Knowing whether your clause contains an auxiliary verb tells you whether to reach for V2 or V3.
V1: Base Form (Infinitive Stem)
The dictionary headword used for present tense, imperatives, modal constructions ("will speak"), and to-infinitives ("to speak").
V2: Simple Past Tense
Marks an action completed at a specific time in the past. V2 always stands as the finite verb without an auxiliary.
V3: Past Participle
Pairs with have/has/had to build perfect tenses ("has spoken") or with forms of be to build the passive voice ("was spoken").
• Common Irregular Verb Mistakes to Avoid
Even native speakers occasionally swap V2 and V3 forms in rapid conversation or confuse transitive and intransitive irregular pairs like lie and lay. Watch out for these three frequent conjugation errors:
Using V3 Without an Auxiliary
A past participle (V3) like "seen," "done," or "begun" cannot act as a standalone past-tense verb; either switch to V2 or insert "have/has/had."
Pairing "Have" With V2
Perfect tenses require the V3 past participle after have, has, or had, never the V2 simple past form ("went," "wrote," "drank").
Confusing Lie and Lay
Intransitive "lie" (to recline) conjugates as lie / lay / lain, whereas transitive "lay" (to place an object down) conjugates as lay / laid / laid.
• Irregular Verbs List: Top 50 Common Irregular Verbs
Although modern English contains roughly 200 irregular verbs, this core group of 50 accounts for the vast majority of irregular past-tense usage in daily speech and writing. Click any verb below to view its definition, pronunciation, and V1/V2/V3 forms.
• Browse Irregular Verbs by Letter (A to Z)
• Irregular Verb Finder & Search Tool
Use the search tool below to filter irregular verbs by starting letters, ending letters, vowel patterns, or exact word length.
• Test Yourself: Spot the Irregular Verb
Identify the vowel-shifted past tense (V2) or past participle (V3) form in each sentence below. Click the irregular verb to check your score.