Difficulty: Easy
Correct Answer: him to leave
Explanation:
Given data
Concept/Approach
Verbs such as 'forbid', 'allow', 'advise' commonly take the pattern: verb + object + infinitive ('forbid him to leave'). A possessive + gerund ('his leaving') is sometimes grammatical but is less idiomatic with 'forbid' in modern usage and is not the keyed choice.
Improved sentence
'You cannot forbid him to leave.'
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