The past tense of "book" is "booked". You use it when referring to a past event where you reserved something like a hotel or flight. For example, "I booked a vacation to Hawaii last year." In the English language, we often create the past tense by adding "-ed" to the end of regular verbs, making "book" into "booked". This follows the standard rule of transforming present to past for regular verbs. However, be aware, there are many irregular verbs in English, which don't follow this rule. Therefore, learning English often involves memorizing these irregular forms. Isn't language wonderfully quirky?
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