Complete the time traveler's awkward apology.

I'm so sorry! Yesterday, I accidentally ___ on a dinosaur and changed history!

The correct answer is stepped.

The word "Yesterday" is a huge clue that this happened in the past. Unlike in Vietnamese, where tense is shown by adding words like "đã" while keeping the verb the same, English verbs must physically change their shape to show the past tense. For regular verbs like "step," we double the final consonant and add "-ed."