1. The voice of the verb is distinct from its tense. Don't confuse the passive voice with the past tense. (Sentence 2 happens to be in the past tense, but 3 is not; both 2 and 3 are in the passive ...
Writing in the active voice makes the meaning clear while keeping sentences from becoming complicated and wordy. Sentences using passive voice are not necessarily wrong, just less effective than ...
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