The Instrumental Trap: 'Vinā', Case Choice, and Sandhi in a Grammar Script
In a grammar test, students must fill in the correct form: 'rāmaḥ ___ (sītā) vinā vanaṃ na gacchati.' The expected answer is 'sītayā' because the textbook teaches that vinā governs the instrumental case. Three students write: A 'sītayā', B 'sītāyāḥ', C 'sītām'. The teacher's note also says that vinā may take the ablative in some classical usage; the class must follow the prescribed textbook. The class has 32 students; 18 wrote sītayā, 9 wrote sītāyāḥ, 5 wrote sītām. A parent complains that B's answer is also correct in 'real Sanskrit.' You must decide the marking policy and also address a second sentence: 'rāmaḥ sītayā saha vanaṃ gacchati,' where one student wrote 'sītā sahā'. The exam also asks for sandhi: 'rāmaḥ + gacchati' → 'rāmo gacchati' (visarga sandhi). One student wrote 'rāmaḥ gacchati' saying 'no change is needed.'
1. Should B's 'sītāyāḥ' receive any credit? Decide the marking policy with reference to the textbook rule and the parent's objection.
Read the worked answer
C is clearly wrong: sītām is accusative, and vinā does not take the accusative here. A is the textbook answer: vinā with instrumental. B's ablative is defensible in classical Sanskrit, where vinā can govern the ablative (e.g., vinā sītāyāḥ). The parent is right about general Sanskrit, but the exam is assessing the prescribed rule. Policy: award full marks to A; award B either full or a clearly announced alternative if the syllabus permits the ablative, but if the textbook has taught only the instrumental, give B partial credit (e.g., 0.5/1) and explain that the form is not wrong in Sanskrit, only outside the taught pattern. Do not mark B wrong outright without noting the grammatical fact.
2. Diagnose the errors in 'sītā sahā' and 'rāmaḥ gacchati'. What concept does each reveal?
Read the worked answer
'sītā sahā' fails because saha is a postposition meaning 'with' and governs the instrumental; the noun should be sītayā, not nominative sītā, and sahā is not the standard form. The student may be treating saha as a verb-like word or copying the nominative from the subject. 'rāmaḥ gacchati' fails visarga sandhi: final -ḥ before voiced g becomes -o, giving rāmo gacchati. The student is applying 'no change' because the letters look different, missing that sandhi is conditioned by the following sound. Both errors are systematic, not careless.
3. Design a three-item remedial worksheet that targets these two errors plus one new but related item.
Read the worked answer
Item 1: fill in 'rāmaḥ ___ (sītā) vinā gacchati' and then rewrite the sentence with saha, so students see the same noun in the instrumental with two different words. Item 2: join 'rāmaḥ + gacchati', 'rāmaḥ + tiṣṭhati', and 'rāmaḥ + ca' to show visarga changes before voiced consonants and before ca. Item 3: correct 'sītā sahā' and explain in one line why saha cannot stand with a nominative. Each item should require a reason, not just a form, so the worksheet diagnoses the concept rather than drilling the answer.