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Past tense of “speed”

🏎️ To move very fast.

Number 104 of 175 by frequency — common in reading and television, less so in your own speech, and the past and the participle are both sped. Recognising it is the priority.

British and American English

British English prefers the short -t ending, undefined; American English regularises it to sped. Both are correct, and a whole group behaves this way — burn, learn, dream, smell, spell — so learning one teaches you the rest.

Two forms, learned as one word

The past simple and the past participle are the same word, sped. Half the work disappears: learn speed · sped and you have the whole verb. What is left is telling the two jobs apart — The car sped down the highway. is the past simple, The process has sped up recently. is the perfect, and have does all the signalling.

There is no tidy rule connecting speed to sped — this is a verb you memorise as a pair and stop analysing. The consolation is that it is a pair and not a trio: speeded is the only wrong answer worth guarding against.

The same pattern — twins — runs through 73 verbs: