The past tense of the word "alert" is "alerted." When we want to talk about something that happened in the past, we add -ed to the base form of regular verbs, including "alert." So if you want to say that someone was alert or became alert in the past, you would say they "alerted" or "became alerted." For example, "She alerted the team about the upcoming meeting" or "He became alerted to the potential danger." It's important to remember that irregular verbs, on the other hand, don't follow this pattern and have their own unique forms in the past tense.
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