Passive of an Intransitive Verb: 'बालकः हसति' in Karmaṇi Practice
A 2-mark grammar question asks: 'कर्मणि प्रयोगे परिवर्तयत - बालकः हसति.' The expected answer in the key is 'बालकेन हस्यते' with a note that the verb is akarmaka, so the construction is bhāve prayoga, not true karmaṇi. In a class of 24, nine students wrote 'बालकः हस्यते', six wrote 'बालकेन हस्यति', and the rest wrote 'बालकेन हस्यते'. The teacher's colleague wants to accept 'बालकः हस्यते' because the student recognized a passive ending and changed the verb. The teacher points out that retaining the nominative 'बालकः' makes the boy the subject of a passive, which would require a transitive verb with an object. The textbook chapter distinguishes karmaṇi from bhāve and uses intransitive verbs like has, gam, and pat for bhāve. The teacher must decide the marking and prepare a remedial note before the next period.
1. Which answers are correct, and how should the nine 'बालकः हस्यते' answers be marked?
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Correct answer: बालकेन हस्यते. Because हस् is akarmaka (intransitive), there is no karma to become nominative; the passive is bhāve, and the agent takes tṛtīyā. The nine बालकः हस्यते answers get 0/2: they keep a nominative agent, which is the pattern for transitive karmaṇi (e.g., रामेण फलं खाद्यते → फलं खाद्यते). With an intransitive verb there is no object to occupy the nominative, so बालकः has no role. The six बालकेन हस्यति answers also get 0/2: the case changed but the voice did not. Feedback should credit recognition of the passive ending while correcting the construction.
2. How should the teacher explain the difference between karmaṇi and bhāve using the students' own examples?
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Start with a transitive pair: रामः फलं खादति → रामेण फलं खाद्यते. Here फलम् becomes nominative, so it is karmaṇi. Then remove the object: बालकः हसति has no object, so the action itself is highlighted: बालकेन हस्यते. Ask 'kena hasyate?' - the instrumental answers. There is no 'kim hasyate?' because nothing is laughed. The test: if the active sentence has a dvitīyā object that can become nominative, use karmaṇi; if not, use bhāve.
3. A student writes 'बालकेन हसितम्'. Is that acceptable, and what does it show?
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बालकेन हसितम् is a past passive participle (kta) construction, not the present passive required. It could mean 'was laughed' impersonally, but the prompt asks for present हसति. So 0/2 for tense, though the student has grasped the instrumental agent and the bhāve idea. Feedback: present passive हस्यते, past passive हसितम्.