The active voice of the given sentence using simple past tense is "The lecture bored the attendees".
What do you mean by Active voice?
An active voice may be defined as a grammatical voice that utilizes the subject of the sentence as the recipient of the verb's action.
Active voice initiates a sentence with an action verb, the subject perpetrates the action indicated by the verb.
Therefore, the active voice of the given sentence using simple past tense is "The lecture bored the attendees".
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