
In/under no circumstances
Emphasis on Prohibition
The phrase adds strong emphasis to rules or prohibitions, indicating something must be completely avoided.

Under no circumstances are visitors allowed to touch the artwork.
Fixed Position
The phrase usually comes at the beginning of a sentence for extra emphasis, followed by an auxiliary verb and the subject.

In no circumstances will we accept late submissions.
Negative Situations
It's often used to refer to negative situations or outcomes that should be avoided.

Under no circumstances should you share your password with others.
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