In these situations the noun takes genitive case i.e., Single /Kasrah/ if it is definite مِنَ الْبَيْتِ and double /Kasrah/ if it is indefinite فِي مَسْجِدٍ.
However diptotes اَلْمَمْنُوعُ مِنَ الصَّرْفِare the nouns which take /fatħah/ instead of a /Kasrah/ if in genitive case. We have already learnt in the previous lesson i.e., (Lesson 20 section 4) that Diptotes are those nouns or adjectives which never take /tanwīn/ i.e., Double Vowel Mark. So whenever a diptote noun is preceded by a preposition or is /Muđâf Ilaihi/ it will take a /fatħah/ instead of a /Kasrah/ so if we say for example Ahmad's book i.e., كِتَابُ أَحْمَدَ
Previously we have learnt only one situation when a noun takes the accusative case (Lesson 15 section 6) and that is:
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