What’s the Past Tense of Spill? Spilled vs Spilt
By and large, spilled is favoured in American English as both the past tense and past participle. British English, as you may have suspected, prefers spilt, also for both.
Grammarflex »
January 1, 2023
What’s the Past Tense of Spoil? Spoiled or Spoilt?
The preferred past tense in either case appears to be spoiled. In UK English, spoilt is also accepted as a past participle form.
What’s the Past Tense of Spell? Spelled or Spelt?
Unless referring to the ancient and hulled wheat, the past tense of the verb spell is spelt and spelled.