His students who are not doing homework were punished by the teacher.

or

The teacher's students who are not doing homework were punished.

EXPLANATION

Passive voice is used when we want to emphasize the action and recipient of the verb.

The steps how to change the active voice to the passive voice are :

~ pay attention to the verb form whether it's transitive or not. We can't change the active voice that contains an intransitive verb.

~ the object of active voice is moved to the subject of passive voice. Meanwhile, the subject of active voice is changed into the object of passive voice accompanied with the "by" preposition or sometimes it's omitted.

~ all of the verbs are changed into the past participle verb (V³).

BASED ON YOUR QUESTION

Simple Past

A : S+Verb²+O

P : S(O)+to be(was/were)+verb³+by Agent

• The teacher (Subject) punished (verb) his students who are not doing homework (Object).

changes to :

• The teacher's students who are not doing homework (New subject) were punished (verb).

➡ "His students" is changed to "the teacher's students" because we already know who the agent is and we don't have to expose the agent "by the teacher." It's ambiguous when we put "his students" in the front of passive voice.

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Learn more about

Active-Passive voice

yomemimo.com/tugas/26120013

yomemimo.com/tugas/26307313

yomemimo.com/tugas/26446901

yomemimo.com/tugas/26708940

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Details

Grade: XI

Subject : English

Category : Sentence Structure

Code : 11.5.8

Keywords : active, passive