The correct answer: গ) As soon as he reached the station, the train left.
Rule for Negative → Affirmative:
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Negative sentence No sooner had… দিয়ে শুরু হলে affirmative sentence-এ as soon as… ব্যবহার করা হয়।
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Affirmative-এ যে দুটি clause যুক্ত হবে, তাতে past perfect tense ব্যবহার হয় না, সাধারণ past tense থাকে।
Examples:
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Neg.: No sooner had I arrived home than it began to rain.
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Neg.: No sooner had she heard the news than she started weeping.
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Neg.: No sooner had I wanted to catch the bird than it flew away.
Other options:
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ক) As soon as he reaches the station, the train left. → Present tense reaches এবং past tense left মিলছে না।
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খ) As soon as he was reaching the station, the train left. → Continuous tense এখানে সঠিক নয়।
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ঘ) As soon as he had reached the station, the train had left. → দুটোই past perfect, অর্থ ট্রেন আগে চলে গেছে; বাক্যের আসল অর্থ নেই।
Source: A Passage to the English Language, S.M. Zakir Hussain.