Question

what had been discovered by him?
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Answer 1

Answer:

what had been discovered by him in answer

Answer 2

Answer:

• Here is no proper question for the given sentence, yet it is explained below.

• The given sentence ' What had been discovered by him?' is an Interrogative Sentence because it has a question mark (?) and it is asking a question.

• The mentioned sentence is also an example of Passive Voice : What had been discovered by him? So it's Active Voice is : What had he discovered?

• The given sentence has been written in Past Perfect Tense. 'Had' is a helping verb of Past Perfect Tense and after 'had' verb's past participle form is always used.