Past Tense of “burn”
The past tense of burn is burned (burnt in British English); the past participle is burned (burnt in British English).
Why “burn” behaves this way
"Burn" is itself the historical merger of two separate Old English verbs: the transitive "bærnan" (to set something on fire) and the intransitive "beornan" (to be on fire), which gradually blended into a single modern verb covering both roles. The shortened, "-t"-ending form "burnt" belongs to the same small family as "leant," "dreamt," and "spelt" — weak verbs that shortened their vowel and hardened the ending in British English, while American English regularized fully to "-ed."
This merger of two originally distinct Old English verbs is part of why "burn" works so smoothly both transitively ("she burned the toast") and intransitively ("the toast burned") without needing any change in form, unlike some verbs that keep a visibly different causative and non-causative pair (compare "rise" versus "raise"). The noun "brand," meaning both a mark made by burning and, later, a company's identity, traces back to this same root, since branding cattle originally meant literally burning an identifying mark into their hide.
The common confusion
As with "lean" and "learn," the confusion is dialectal rather than grammatical: American English strongly prefers "burned" in every context, while British English commonly uses "burnt" as an adjective ("burnt toast") even when it defaults to "burned" as an ordinary verb form, a subtler split than the more even alternation seen in "leaned/leant."
How it's actually used
"Burn" extends widely into figurative senses of intense feeling or destruction — "burn with anger," "burn bridges" (destroy a relationship irreversibly), "burn out" (become exhausted from overwork) — all metaphorical extensions of literal fire applied to emotion and behavior. Fitness and nutrition use "burn" technically to describe metabolizing calories ("burn 300 calories"), a specialized modern sense with no connection to literal flame. "Burnt offering," a term from ancient religious ritual, preserves one of the oldest ceremonial senses of the word, still recognizable today mostly through biblical and historical references rather than everyday speech. Medicine classifies burns by degree (first, second, third), a precise clinical severity scale built directly on this verb's core sense of tissue damage from heat. "Slow burn" describes gradually building anger or resentment, and "burn the midnight oil" describes working late into the night, two more idioms extending the literal sense of fire into emotional and behavioral territory.
Across the tense system
"Burned out" and "burnt out" both describe complete physical or emotional exhaustion from prolonged stress, a figurative use so common in modern workplace vocabulary that "burnout" has become a standalone noun describing a recognized occupational condition, distinct from any literal sense of fire. "Burn bridges" strongly implies a permanent, irreversible rupture in a relationship, distinct from milder phrases like "burn out," which describes exhaustion rather than severed ties.
Common real mistakes
The main real issue is dialectal inconsistency: switching between "burned" and "burnt" partway through a document instead of picking one regional convention and sticking with it. A separate, genuine error is confusing the specialized fitness sense of "burn" (metabolize calories) with the more general sense of destruction, which can create ambiguous sentences when the surrounding context doesn't make clear which is meant. A further mix-up some learners make is confusing "burn out" (become exhausted) with "burn up" (be destroyed completely by fire, or, informally, become very angry), two phrasal verbs that share the base verb but diverge sharply in meaning depending on the specific particle attached.
Examples
- She burned the toast again this morning.
- He has burned through his savings in under a year.
- They burnt the old letters in the fireplace. (British English)
- We had burned dinner twice before finally getting it right.
- The candle burns for about six hours.
- Don't burn any bridges on your way out.
- She's burning with curiosity about the results.
- The sun burned his skin within the first hour.
Memory trick
Remember "burn" merges two old Old English verbs, which is why it works equally well with or without an object — and group British "burnt" with "leant" and "dreamt" as the same shortened-vowel family, defaulting to "burned" for American audiences.