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The past participle of "sped" is "sped."
Sped is the preterit,( I sped) past conditional ( I would have sped), and plusperfect (I had sped) of the verb speed.
The group sped away from the police.He sped up his writing in order to finish the test before the time ran out.
sped. The past participle is also sped.
They sped through the night.
Sped is the past tense of speed.