burn, burned (burnt), burned (burnt)

Is it burned or burnt?

Both Amercian and British use "burned" as past tense and past participle.

In American English, "burnt" is use as an adjective and "burned" is used as the past tense verb.

E.g.
Does burnt toast cause cancer?
My toast is burnt. The toaster burned it.

In US, "burnt" is used as adjective only.

But, in UK, both "burned" and "burnt" are acceptable past tense and past participle of burn.

The meaning of "burn"

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