Select the option that has an error in the use of present tense.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. I am observing your mischievous activities for half an hour.
Error concept: Incorrect use of present continuous instead of present perfect continuous.
What is wrong: The phrase “I am observing … for half an hour” is wrong because the action started in the past and continues till now, so present perfect continuous should be used.
Grammatical concept:
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Present continuous (am/is/are + V-ing) → for actions happening right now.
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Present perfect continuous (have/has been + V-ing) → for actions that began in the past and are still continuing (often with “for” or “since”).
Incorrectness of the concept in context: Use of present continuous with “for half an hour” is grammatically incorrect.
How to correct: Replace “I am observing” with “I have been observing.”
Correct phrase/ correction: I have been observing your mischievous activities for half an hour.
Final sentence: I have been observing your mischievous activities for half an hour.
Hence, the chosen option is correct.