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Sentence Correction: Subject Verb Agreement Questions - Overview

According to a study by an occupational health journal, an employee at a hi-tech firm could be at high risk for developing repetitive stress injuries (RSIs), who spends long hours seated in front their computer without changing position.

Incorrect.

This answer choice is illogical and grammatically incorrect. The relative clause who spends long hours seated in front of their computer without changing position is intended to modify the noun employee. In this answer choice, however, it follows the noun injuries, and injuries cannot spend long hours. Furthermore, the relative pronoun who is supposed to refer to a human noun but it refers to injuries instead.

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In addition, this answer choice has a Pronoun Agreement mistake: the pronoun their is intended to refer to the noun employee, but their is plural and employee is singular.

Incorrect.

This answer choice is illogical and grammatically incorrect. The modifier seated is intended to modify employee, yet it is incorrectly placed next to the word position, without being separated by a comma. An employee can logically be seated in front of a computer, but a position cannot be seated

In addition, this answer choice has a Pronoun Agreement mistake: the pronoun their is intended to refer to the noun employee, but their is plural and employee is singular.

Incorrect.

This answer choice is grammatically incorrect. The relative clause which is due to long hours of sitting without changing position in front of a computer follows the noun injuries, and so appears to modify it, but the singular verb is does not agree with the plural noun injuries.

[[snippet]]

Incorrect.

While this answer choice corrects the Pronoun Agreement mistake in the original question, by changing their computer to his computer, it is stylistically flawed.

The use of the passive construction in the phrase without the position being changed makes the corrected sentence awkward and wordy.

Well done!

This answer choice corrects the Relative Clause mistake in the original question by changing the relative clause (who spends, etc.) to a reason clause (due to long hours spent...) therefore eliminating the error caused by the incorrect placement of the relative pronoun who next to injuries.

This answer choice also corrects the Pronoun Agreement mistake in the original question, by changing their computer to a computer.

who spends long hours seated in front of their computer without changing position
due to long hours spent seated in front of a computer without changing position
spending long hours without changing position seated in front of their computer
which is due to long hours of sitting without changing position in front of a computer
without the position being changed for the long hours spent in front of his computer