Astonishing Facts About Your English" by M. B. Sackheim (bylined Sherwin Cody advertorial), Current Opinion Nov 1921 (leaf 120)
The pattern
This still sits in the public-domain pool. No pattern name yet.
Why it works
Self-diagnosis of grammatical errors creates immediate educational insecurity. The interactive test reveals common spoken blunders, making self-improvement courses feel indispensable.
Steal this when
When selling writing or speech courses by letting prospective students diagnose their own mistakes.
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