What is an Irregular Verb?
Definition, Rules, Patterns & Comprehensive Irregular Verb Lists
An irregular verb is a verb that forms its simple past tense and past participle through vowel shifts or root changes rather than appending the standard -ed or -d suffix (e.g., write / wrote / written, go / went / gone).
Because irregular verbs trace back to historical Old English patterns, they account for some of the most frequently spoken and written words in our language. Learn the main vowel-change family groupings to speed up memorization, review common conjugation traps, and browse full verb charts.
• Table of Contents
• Understanding Irregular Verbs
Irregular verbs carry the historical quirks of the English language. Instead of neatly adding "-ed" to form the past tense, these verbs shift their internal vowels or change spelling completely. While they can be frustrating, they include some of our most frequently used words, so memorizing them is unavoidable.
The verbs that survived as "irregular" are mostly the ones we use every single day. Because they were used so frequently, people simply refused to change how they said them! Here is how they compare to regular verbs:
Regular Verbs
The conformists. They follow the simple rule of adding "-ed" for both the past tense and past participle.
Irregular (Vowel Shift)
These strong verbs change their inner vowels entirely to show a change in time. No "-ed" in sight.
Irregular (Unchanging)
The stubborn ones. Some irregular verbs refuse to change their form at all, regardless of what time it is.
• See it in Context
The most common trap for English learners is mixing up the simple past and the past participle. Using "I have went" instead of "I have gone" immediately disrupts a sentence, highlighting why distinguishing between these forms is critical for fluent communication.
• The 4 Patterns of Irregular Verbs
Although they break the standard "-ed" rule, irregular verbs are not entirely chaotic. They can fall into predictable vowel-shift families that make them significantly easier to learn once you recognize the pattern.
Group 1: Identical Forms
The easiest to memorize. The Base, Past, and Past Participle are exactly the same.
- put → put → put
- let → let → let
- cost → cost → cost
Group 2: Past & Participle Match
The V2 and V3 forms are exactly the same word.
- buy → bought → bought
- catch → caught → caught
- feel → felt → felt
Group 3: Base & Participle Match
The verb takes a journey and comes back. The V1 and V3 forms are the same.
- run → ran → run
- come → came → come
- become → became → become
Group 4: All Forms Different
The trickiest group. Every single form is spelled differently.
- drive → drove → driven
- sing → sang → sung
- eat → ate → eaten
• The V1, V2, V3 System Explained
When learning English, you'll often see irregular verbs presented in a three-column table. Teachers refer to these as V1, V2, and V3. Understanding exactly when to use each column is critical for grammatically correct sentences.
V1: Base Form
The dictionary form of the verb. Use this for present tense (I go), future tense with "will" (I will go), and infinitives (to go).
V2: Simple Past
Use this when an action happened in the past and is completely finished. It stands alone without any helping verbs.
V3: Past Participle
Cannot stand alone. It must be paired with helping verbs (have, has, had) to form perfect tenses, or used to form the passive voice.
• Common Mistakes to Avoid
Because irregular verbs don't follow logic, they are the source of the most noticeable grammar errors in both spoken and written English. Here are the top three traps to avoid:
Using V3 Without a Helper
The Past Participle (V3) cannot be the main verb of a sentence on its own. It needs "have", "has", or "had".
Using V2 With a Helper
When you use "have", you must use the V3 form, never the V2 simple past form.
Forcing the "-ed" Rule
Children and non-native speakers often logically try to add "-ed" to irregular base verbs.
• Top 50 Most Common Irregular Verbs
While there are roughly 200 irregular verbs in modern English, a small handful do almost all of the heavy lifting. In fact, you use these verbs dozens of times a day without realizing it. Here are the top 50 most essential irregular verbs to memorize. Click any verb to see its full conjugation, definition, and forms.
• Browse Irregular Verbs by Letter
Looking for a specific rule-breaker? Dive into our complete directory of irregular verbs, organized from A to Z. While many older irregular verbs have faded into obscurity (or become regular over time), we maintain a comprehensive, up-to-date database of every accepted irregular verb in modern English.
• Irregular Verb Finder & Search Tool
Need something highly specific? Use our advanced word finder tool to hunt down irregular verbs by starting letters, ending letters, or exact word lengths. Perfect for writers, ESL students, and crossword puzzle enthusiasts.
• Test Yourself: Spot the Irregular Verb
You've learned the patterns and the rules. Now, it's time to put your knowledge to the test! Tap or click the correctly conjugated irregular verb in each sentence below to prove your mastery.