Law is a non-jussive conditional particle. The kāna clause is the protasis; لَفَسَدَتَا is its response, with the response lām and a dual subject marker.
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Parsing the Law Example
Conditional Particles: In, Law and Ammā
Law is a non-jussive conditional particle. The kāna clause is the protasis; لَفَسَدَتَا is its response, with the response lām and a dual subject marker.