Question : Identify the segment in the sentence which contains a grammatical error.
She has been working tirelessly since hours.
Option 1: since hours
Option 2: tirelessly
Option 3: She has
Option 4: been working
Correct Answer: since hours
Solution : The error lies in the first option.
The correct expression should be for hours instead of since hours. When talking about the duration of an action that started in the past and continues into the present, we use for, followed by a period of time. Since is used to specify a point in time when an action began, not a duration.
Therefore, the correct sentence should be: "She has been working tirelessly for hours."
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