رَأَيْتُ مَسَاجِدَ: direct object — accusative; fatḥa marks the accusative.
مَرَرْتُ بِمَسَاجِدَ: after a preposition — genitive; fatḥa marks the genitive.
The visible vowel is identical, but the syntactic case differs. Always use the governing ʿāmil to identify the case.
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Diptote Causes — Ultimate Broken-Plural Patterns
رَأَيْتُ مَسَاجِدَ: direct object — accusative; fatḥa marks the accusative.
مَرَرْتُ بِمَسَاجِدَ: after a preposition — genitive; fatḥa marks the genitive.
The visible vowel is identical, but the syntactic case differs. Always use the governing ʿāmil to identify the case.