A Hundred and One Rules in Arabic Grammar!

  1. Phony/Fake Idaafa. ======================

You might have noticed that the noun which follows the adjective that is in the superlative form structure is in the genitive case.

**بَيتي أصغرُ بَيتٍ في القريَةِ.**

The reason is that this combination creates the Syntactical Environment for Idaafa. Because the components of this structure are not limited to the usual nouns (the first term is in fact an adjective) Arab Grammarians tend to call this Phony/Fake Idaafa.