Directions: Which of the phrases given in (1), (2), (3), (4) should replace the phrase printed in bold in the sentence to make it grammatically correct? If the sentence is correct as it is given and 'No correction is required', mark (5) as the answer.
To be successful it is important to know why your failure in the past and ensure that it doesn't happen again.
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why you had failed
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because you have failed
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that your failure
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where you were failed
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No correction required
A
Correct answer
Explanation
The sentence requires the past perfect tense to show an action completed before another past action ('ensure'). 'Why you had failed' correctly uses the past perfect to indicate that understanding past failures occurred before ensuring they don't repeat. The original 'why your failure' is a noun phrase clause and grammatically incorrect in this context.