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You've already aswered the question: it's spilt.
I spilt
You spilt
He/She spilt
We spilt
They spilt
One way to use "spilt" in a sentence is: "I accidentally spilt my drink on the table." In this sentence, "spilt" is the past tense of "spill," meaning to accidentally pour or let something flow out of its container.
The ISBN of The Blood Spilt is 0385339828.
The Blood Spilt was created in 2004.
The Blood Spilt has 341 pages.