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34 Mohammad Mahfooz HussainSpecial Cases in Passive Voice:I. Interrogative sentences in passive voice:1. Who:Active: Who discovered radium?Passive: By whom was radium discovered?Possible alternative passive: Who was radium discovered by?Syntax:Active Who + V + Object?Passive By whom + Be (verb) + Object + V3?Alternative Who + Be (verb) + Object + V3 + By?

