Starting with one of أ، ن، ي، ت is only part of the author’s second test.
The pattern must have a verbal counterpart, begin with an imperfect prefix, and fail the feminine-suffix test in the sense intended here. Its proper-name status also matters in this diptote discussion.
Do not declare every noun beginning with alif diptote.
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Diptote Causes — Verb Patterns and Their Conditions
Starting with one of أ، ن، ي، ت is only part of the author’s second test.
The pattern must have a verbal counterpart, begin with an imperfect prefix, and fail the feminine-suffix test in the sense intended here. Its proper-name status also matters in this diptote discussion.
Do not declare every noun beginning with alif diptote.