प्र:

Vissu said, "We passed by a beautiful lake when we went on a trip to Goa."

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  Vissu said that they passed by a beautiful lake when they had gone on a trip to Goa.
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  Vissu said that they has passed by a beautiful lake when they went on a to Goa.
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  Vissu said that they had passed by a beautiful lake when they had gone a trip to Goa
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  Vissu said they passed by a beautiful lake when they went on a trip to Goa.