Question : Directions: In the following question, some parts of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If the sentence is free from error, select 'No Error'.
Water contamination has become more serious (1) / since chemists have begun to use (2) / new substances. (3) / No Error (4)
Option 1: (1)
Option 2: (2)
Option 3: (3)
Option 4: (4)
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Correct Answer: (2)
Solution : The correct choice is the second option .
Explanation : The verb "using" (gerund) should replace "to use" (infinitive) in the second part of the sentence. The verb "have begun" is followed by a gerund (the -ing form of a verb) when indicating an ongoing or continuous action.
Therefore, the correct sentence is: "Water contamination has become more serious since chemists have begun using new substances."
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