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Sentence improvement – confirm correct idiom: 'warn against + gerund' is standard; the sentence 'You are warned against committing the same mistake again' is already correct and formal.

Difficulty: Easy

to commit
for committing
against to commit
No improvement

Correct Answer: No improvement

Explanation:

Given sentence
'You are warned against committing the same mistake again.'

Concept/Approach
After 'warn against', use a gerund: 'against committing'. The sentence is concise and idiomatic.

Why alternatives are incorrect
'to commit' → wrong structure after 'against'.'for committing' → changes meaning (sounds like 'punished for').'against to commit' → ungrammatical double marker.

Final Answer
No improvement

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