Question

my austere father used to avoid all inessential comforts and luxuries (voice change )​

Answer 1

all inessential comforts and luxuries were used to be avoided by austere father...

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have a good day...

Answer 2

Answer: all inessential comforts and luxuries were avoided by my austere father

Explanation: in the question, the voice used is active voice so we have to change it into passive. In the question, "my  austere father " is the subject and " all inessential comforts and luxuries" is the object; so when we change the voice into passive :"my  austere father " becomes the object and " all inessential comforts and luxuries" becomes the subject. (And other necessary changes are to be made in the sentence to make it grammatically correct)