هَذِهِ دَوَابُّ — These are animals; dawābb is a nominative predicate with ḍamma.
رَأَيْتُ دَوَابَّ — I saw animals; dawābb is an accusative object with fatḥa.
مَرَرْتُ بِدَوَابَّ — I passed by animals; dawābb is genitive with fatḥa.
The shadda on بّ remains in all forms, while the final case vowel changes.
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Diptote Causes — Ultimate Broken-Plural Patterns
هَذِهِ دَوَابُّ — These are animals; dawābb is a nominative predicate with ḍamma.
رَأَيْتُ دَوَابَّ — I saw animals; dawābb is an accusative object with fatḥa.
مَرَرْتُ بِدَوَابَّ — I passed by animals; dawābb is genitive with fatḥa.
The shadda on بّ remains in all forms, while the final case vowel changes.