Question : Directions: In the following question, out of the four alternatives, select the alternative that will improve the bracketed part of the sentence. In case no improvement is needed, select "No Improvement".
He has been working (off and on) for several years on this theory.
(1) regularly
(2) on or off
(3) on and off
(4) No Improvement
Option 1: 1
Option 2: 2
Option 3: 3
Option 4: 4
Correct Answer: 3
Solution : The sentence can be improved using the third option.
The idiom off and on should be replaced with on and off to convey the intended meaning that he had been working on the theory for several years with interruptions.
On and off is the correct form of the idiom which means doing something erroneously and not regularly.
Therefore, the correct sentence should be: "He has been working on and off for several years on this theory."
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