The past tense of the word "spot" is "spotted". Expanding on that, the word "spot" is a verb and in English language, regular verbs such as "spot" form the past simple tense by adding -ed to the base form of the verb. Therefore, "spot" becomes "spotted" when talking about the past. For example, "I spotted a rare bird in the park yesterday." It's like looking back at your life through a rearview mirror; the images are past events, hence, "spotted". Keep in mind, English contains a lot of irregular verbs too which do not follow this principle.
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