Second-person forms: كَتَبْتَ (you, masc.), كَتَبْتِ (you, fem.), كَتَبْتُمَا (you two), كَتَبْتُمْ (you, masc. plural), كَتَبْتُنَّ (you, fem. plural).
In كَتَبَا the dual alif is a subject pronoun; in كَتَبُوا the group wāw; in كَتَبْنَ the feminine-plural nūn.
These are selected illustrations, not the complete paradigm.
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Pronouns: definitions, forms, usage, and parsing
Second-person forms: كَتَبْتَ (you, masc.), كَتَبْتِ (you, fem.), كَتَبْتُمَا (you two), كَتَبْتُمْ (you, masc. plural), كَتَبْتُنَّ (you, fem. plural).
In كَتَبَا the dual alif is a subject pronoun; in كَتَبُوا the group wāw; in كَتَبْنَ the feminine-plural nūn.
These are selected illustrations, not the complete paradigm.