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36 Mohammad Mahfooz Hussain%u2192 Marie Curie discovered radium.Step %u2013 2: Change it into passive.%u2192 Radium was discovered by Marie Curie.Step %u2013 3: Make the whole sentence an interrogative sentence by bringing the auxiliary verb to the beginning of the sentence.%u2192 Was radium discovered by Marie Curie?Step %u2013 4: Replace the answer (that was earlier given by us) with %u201cwhom%u201d. As Marie Curie is the object of the passive sentence, and the objective form of %u201cWho%u201d is %u201cWhom%u201d, thus whom is the only option.%u2192 Was radium discovered by whom?Step %u2013 5: The use of an auxiliary verb at the beginning is a feature of a yesno question, not a Wh-question, so we need to bring the Wh-word (along with its preposition %u201cby%u201d) to the beginning.The final passive form %u2192 By whom was radium discovered?More examples: Active Voice Passive VoiceWho was training Alam for the volleyball tournament?By whom was Alam being trained for the volleyball tournament?Who has authorized anyone to bypass the network security protocols?By whom has anyone been authorized to bypass the network security protocols?
