Their students don't break the window.
I just tried almost everything but it still doesn't make sense.
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Sign up to join this communityTheir students don't break the window.
I just tried almost everything but it still doesn't make sense.
I assume the sentence is "Their students do not break the window."
If that's the case, the closest you can get to the passive voice form of this sentence would be "The window is not broken by their students." (switch the positions of subject and object and use the past participle form of the verb)
As you can see, this form of the sentence is extremely awkward, which is why passive voice is usually not used in writing, unless it is absolutely necessary or if it has stylistic effect.
Furthermore, the intended meaning of the two differs slightly. The original sentence in the active voice simply states that the students don't break a specific window. However, the passive voice form implies that the window is already broken, and it sounds like you are trying to explain that the students are not responsible.