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Sentence Correction: Pronoun Questions - One

A major medical center recommends that doctors take a brief nap during long shifts, because studies show that if shift-workers lose sleep one-night and accumulated a sleep deficit on the following days, their reaction-time and judgment will be impaired.

Incorrect.

This answer choice is grammatically incorrect. We identify the sentence as a Conditional 1 sentence by the use of Present Simple in the first verb in the condition part (if shift-workers lose) and by the use of the Future tense in the result part (will be impaired).  However, the second verb in the condition part (accumulated), which should also be in the Present Simple tense, is in the Past Simple.

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Well done!

This answer choice corrects the Conditionals mistake in the original question, by changing the tense of the second verb in the condition part of the sentence from Past Simple (accumulated) to Present Simple (accumulate).

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Incorrect.

While this answer choice corrects the original Conditionals mistake in the original question, it creates a new Conditionals mistake. By changing will be impaired to was impaired, this answer choice incorrectly uses the Past Simple in the result part of a Conditional 1 sentence.

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Incorrect.

This answer choice repeats the original Conditionals mistake. We identify the sentence as a Conditional 1 sentence by the use of Present Simple in the first verb in the condition part (if shift-workers lose) and by the use of the Future tense in the result part (will be impaired).  However, the second verb in the condition part (accumulated), which should also be in the Present Simple tense, is in the Past Simple.

Moreover, the result part of a Conditional 1 should be in the Present Simple or Future, but this answer choice incorrectly uses the Past Simple (impaired).

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Incorrect.

While this answer choice corrects the original Conditionals mistake, it creates a new grammatical mistake. The pronoun one refers only to itself. However, the noun referred to in the earlier part of the sentence is not one but shift workers. The correct pronoun in this case would be their.

accumulated a sleep deficit on the following days, their reaction-time and judgment will be impaired
accumulate a sleep deficit on the following days, their reaction-time and judgment will be impaired
accumulate a sleep deficit on the following days, their reaction-time and judgment was impaired
accumulated a sleep deficit on the following days, it impaired their reaction-time and judgment
accumulate a sleep deficit on the following days, this impairs one's reaction-time and judgment