Whether one is writing an essay, narrative, or a Web bio, choose the appropriate verb tense and stick with it throughout. Otherwise, it will feel like the writer is veering wildly from the present tense to past tense and the reader will be thoroughly confused. Decide from the outset which verb tense to use and stay with it unless the timing of the action requires the writer to change tenses.
She intended to play for her local soccer team in the fall, but then she throws out her back. (Shifting to the present tense is acceptable in casual speech; but it will not do in writing.)
Corrected Version: She intended to play for her local soccer team in the fall, but then she threw out her back.
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