هَذِهِ الطَّالِبَةُ مُجْتَهِدَةٌ.
Translation: This female student is diligent.
هَذِهِ: indeclinable demonstrative in nominative position. الطَّالِبَةُ: nominative apposition. مُجْتَهِدَةٌ: nominative feminine predicate.
The demonstrative itself stays fixed, although the identifying noun and predicate visibly carry nominative endings.
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Demonstratives — forms, syntax and usage
هَذِهِ الطَّالِبَةُ مُجْتَهِدَةٌ.
Translation: This female student is diligent.
هَذِهِ: indeclinable demonstrative in nominative position. الطَّالِبَةُ: nominative apposition. مُجْتَهِدَةٌ: nominative feminine predicate.
The demonstrative itself stays fixed, although the identifying noun and predicate visibly carry nominative endings.