Question

When had your mother cooked food?Change into passive voice
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Answer 1

Answer:

the food was cooked by mom

Answer 2

Answer:

When had food been cooked by your mother?

Explanation:

Question- When had your mother cooked food?

Step 1- Making the sentence assertive by removing (when).

Result- Your mother had cooked food.

Step 2- Change the voice of above sentence.

Result- Food had been cooked by your mother.

Step 3- Making the sentence in yes/no type question by placing (had) before food.

Result- Had food been cooked by your mother?

Step 4- Now place (when) before above sentence.

Result- When had food been cooked by your mother?