Question

Salma had eaten food.

Change the Passive voice

Answer 1

hey !

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Salma had eaten food

This sentence shows the completed action hence it is a past perfect tense .

Passive voice will be

Object + had been + third form of verb + by + second form of subject

Food had been eaten by Salma

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Answer 2

Heya! !
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The sentence is in past perfect tense.

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In order to change it in the PASSIVE VOICE.
There are RULES :
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First comes object at the place of Subject :

Then helping verb :
HAD changes into had been.

The third form of the verb

At last Subject comes at the object place :

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ANSWER :

$food \: had \: been \: eaten \: by \: salma$