Question

we should respect elders (change passive voice)

Answer 1

Heyya.. Here's your answer..
Elders should be respected by us.
Hope it helps you...

Answer 2

Pikachu! Your answer ^^
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Elders should be respected by us

In a passive voice:

Object is changed into subject

3rd form of verb is used 

officials are changed according to rules
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Pikachu! ^_~