We shall go to Amritsar when my sister ________ from Kolhapur.
Select the correct alternative from the following to complete the sentence meaningfully.

The correct answer is Option C (returns).

Key Points:
• Concept: Sequence of Tenses in Future Time Clauses. When the principal clause is in the Simple Future Tense ('We shall go...'), the adverbial clause of time introduced by 'when' must be in the Simple Present Tense.
• Explanation: In 'when my sister returns from Kolhapur', 'returns' is in the Simple Present Tense, properly completing the sentence.
• Other Options: 'will return' violates the rule prohibiting future tense in 'when' clauses; 'returned' is past tense.
• Official Key: Option 3 ('returns') is the official answer declared in the answer key.
• Key Takeaway: Remember: Main Clause (Future) + Time Clause with 'when' takes Simple Present Tense.