Compare singular, dual and plural. The verb after the mubtada shows the same number.
Verbal sentenceNominal sentenceدَخَلَ الْمُعَلِّمُالْمُعَلِّمُ دَخَلَدَخَلَ الْمُعَلِّمَانِالْمُعَلِّمَانِ دَخَلَادَخَلَ الْمُعَلِّمُونَالْمُعَلِّمُونَ دَخَلُوا
Compare the endings: the singular has no added number marker, the dual ends in ا, and the masculine plural ends in وا.
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Changing a Verbal Sentence into a Nominal Sentence
Compare singular, dual and plural. The verb after the mubtada shows the same number.
Verbal sentenceNominal sentenceدَخَلَ الْمُعَلِّمُالْمُعَلِّمُ دَخَلَدَخَلَ الْمُعَلِّمَانِالْمُعَلِّمَانِ دَخَلَادَخَلَ الْمُعَلِّمُونَالْمُعَلِّمُونَ دَخَلُوا
Compare the endings: the singular has no added number marker, the dual ends in ا, and the masculine plural ends in وا.