Question

is he telling a story? change in voice
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Answer 1

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Is a story being told by him?

Explanation ↴

The given sentence is a simple structure of interrogative sentence in Present Continuous tense. When we convert Present Continuous interrogative sentences to Passive Voice, the Is/am/are will be used as a subject. The sentence will look like this { is/am/are + the subject of the interrogative sentence + Being + Past Participle form of the main verb + preposition (by) + Object + Question mark (?) }

Answer 2

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Is he telling Story? Change the voice?

$\huge{ \color {green}{ \underline{ \underline \color{blue} {\textbf{\textsf{Answer :}}}}}}$

Is a story being told by him.