The correct sentence: ক) What he thinks is known to me.
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Know এর passive রূপ হলো is known।
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Noun clause What he thinks বাক্যের subject হিসেবে আছে।
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এটি Present Tense-এ বাক্যের অর্থ ঠিক রাখে এবং passive voice-এর নিয়ম অনুসারে গঠিত।
Passive Voice of Complex Sentence:
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Complex sentence-এ একটি clause subject বা object হিসেবে ব্যবহার হতে পারে।
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Active voice-এর object যদি clause হয়, passive voice-এ তা subject হিসেবে আসে।
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Active voice-এর subject যদি clause হয়, passive voice-এ তা object হিসেবে আসে।
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Clause-এর মধ্যকার verb পরিবর্তিত হয় না।
Examples:
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Act: I know what he thinks. → Pass: What he thinks is known to me.
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Act: He showed me what he had made. → Pass: What he had made was shown me by him.
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Act: She said what she knew. → Pass: What she knew was said by her.
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Act: We will explain why we want to do it. → Pass: Why we want to do it will be explained by us.
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Act: What he has done will save his family. → Pass: His family will be saved by what he has done.
Other options:
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খ) What he thinks was known by me. → Past Simple Passive; মূল বাক্যের Present Tense-এর সঙ্গে মিল নেই।
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গ) What he thinks is being known to me. → Present Continuous Passive; know সাধারণত continuous কাজ বোঝায় না।
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ঘ) What he thinks has been known by me. → Present Perfect Passive; অর্থ “আমি ইতিমধ্যেই জানি”, মূল Present Tense-এর সঙ্গে মিল নেই।
Source: A Passage to the English Language, S.M. Zakir Hussain.
