Question

"please call him at once" change into passive voice.​

Answer 1

Answer:

Passive voice:

You are requested to call him at once.

or

Let him be called at once.

Explanation:

This sentence is an example of imperative sentences.  

Imperative sentences are those in which an instruction, request or command is given. We can change the voice of an imperative sentence by using the following rules:

Let + object+ be + 3rd form of the verb + participle+by + 3rd person subject

Answer 2

HEY MATE, HERE'S THE ANSWER ☺️

You are requested to call him at once.

I hope it'll help you buddy ☺️, please mark it as brainlelist ✨❤️