Question : Identify the segment in the sentence which contains a grammatical error. If there is no error, select 'No error'.
These experiments had been going on since several months.
Option 1: These experiments
Option 2: had been going on
Option 3: No error
Option 4: since several months
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Correct Answer: since several months
Solution : The error lies in the fourth option .
"Since" should be replaced by "for". The words "for" and "since" even though they denote a period of time, can neither be used interchangeably nor synonymously. "For" is used with a period of time in the past, present, or future. "Since" it is used with a point in time in the past. In the given sentence, a period of time, i.e several months, has been mentioned so "for" should be used
Therefore, the correct sentence should be: These experiments had been going on for several months.
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