Hi, friends, please see whether the use of "Since when", "criticism" and sentence structure is right:
we don't know since when (or since which time?) the criticism of teacher to the students has become an "issue".
Thank you!
) the criticism of teacher to the students has become an "issue". We don't know when teacher criticism of students became an issue.
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Loiter9we don't know since when (or since which time?) the criticism of teacher to the students has become an "issue".
We don't know when teacher criticism of students became an issue.