PASSIVE VOICE
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Use present tense, past tense, present perfect tense or future tense:
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���� a)�� �John caught a big fish.
������� A big fish by John.
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�b)������ Sally has baked a lovely cake.
������� A lovely cake� by Sally.
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��� c)�� My friends played tennis.
������� Tennis �by my friends.
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d)� � Christopher Columbus discovered America in 1492.