Question

Nothing will be gained by him change voice

Answer 1

he will gain nothing
hope this helps u
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Answer 2

$\Huge{\red{\textbf {Answer;}}}$

★$\Large{ He \:will\: gain\: nothing}$

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$\huge{\mathfrak{Explanation}}$

★ Voice :- A voice is a term which describes the relationship between the action done and the recipient who did that particular action.

★Active Voice -When the subject is the doer of the action, then the verb is said to be in active voice 

.

★Passive Voice :- When the subject is being acted upon by an action , then the verb is known to be in passive voice.

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◆Some Rules for Changing AV TO PV (passive voice) AND PV TO AV. (Active Voice )

★While Changing AV TO PV the sub in the AV becomes the object in PV.

★While Changing AV TO PV third form of the main been is always used.

★'By' is used in PV Before the object.

==============→

Structure of AV 

★Subject + Verb + Obj

Example :- Ram Has Killed a snake.

================→

★ Structure of PV

★ Object + verb + By +sub

Example :- A snake has been killed by Ram.

Here, 

Answer is :-

☞ He will gain nothing .

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$\Huge{\green{\textbf{Thanks :)}}}$