Question

His returned was no expected by us Change into passive voice

Answer 1

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HEY MATE! THE ANSWER -

We did not expect his return.

HOPE IT HELPED!

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Answer 2

Galat question likha hai, sahi question should be: His return was not expected by us.
And yeh pehle he passive voice mein hai, active mein rehne se yeh aata tha: We did not expect his return.