رَأَيْتُ الطَّالِبَيْنِ.
Translation: I saw the two students.
رَأَيْتُ: past-tense verb; the -tu suffix is the subject.
الطَّالِبَيْنِ: direct object, accusative with yāʾ because it is dual.
Check: If the two students were the subject, the form would be الطَّالِبَانِ.