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she was competing in the marathon which was just over 26 miles long

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ilakkiyadinesh

She was competing in the marathon, which was just over 26 miles long.

As shown.

ilakkiyadineshPast into future

This doesn't make sense as a header. You have nothing in the future in your sentence.

CJ

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She was competing in the marathon, which is just over 26 miles. long


Is this what you want?

She will be competing in the marathon ,which is just over 26 miles.