Question : Directions: In the following question, some parts of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is the answer. If a sentence is free from error, your answer is "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 .
The correct sentence should use a gerund instead of an infinitive verb because the infinitive verb ("to use") emphasises the action itself whereas the gerund ("using") emphasises the ongoing or repeated nature of the action.
Therefore, the correct sentence is: Water contamination has become more serious since chemists have begun using new substances.
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