اعراب جملة هؤلاء الطلاب مجتهدون

These students are diligent. “These” is a pronoun in the nominative case, serving as the subject of the sentence. Students is in the genitive case, with a kasrah, serving as the possessed noun. Diligent is the predicate of the subject, in the nominative case and connected to the subject by the conjunction “و” since it is a plural masculine noun.