Here are the answers to your questions based on the principles of grammar:
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When the subject of the sentence performs the action, the sentence is in active voice. When the subject of the sentence receives the action, and the person or thing doing the action follows the verb, the sentence is in passive voice.
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Sentences with passive voice are wordier because they have an additional helping verb and sometimes the word by. Sentences with active voice are more clear and concise.
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It is appropriate to use the passive voice when the person or thing performing the action is unimportant or unknown.
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Which sentence is written in the active voice?
Rebecca and Lauren went to the beach. -
How would you change the sentence from passive voice to active voice?
Revise it so the person or thing doing the action (the Bluejays) comes before the verb (was won).
To fully rewrite it in active voice, it would be: "The Bluejays won the game."