Final answer:
The passive voice version of the sentence is, "The man was warned by the legal advisor not to use certain emojis in responding to messages."
Step-by-step explanation:
To rewrite the sentence "The legal advisor warned the man not to use certain emojis in responding to messages" in the passive voice, we need to ensure that the subject is being acted upon, use a form of the verb "to be" with the past participle of the main verb, and typically include the preposition "by" followed by the doer of the action.
Following these steps, the passive voice version of the sentence would be: "The man was warned by the legal advisor not to use certain emojis in responding to messages." When we convert sentences from active to passive voice, it's important to note that some sentences could lose their vitality and may become wordier. However, passive voice can be useful when we want to focus on the action itself or when the actor is unknown or irrelevant.