Huwa and anā are nouns, not verbs. Fī is a preposition, not a pronoun; in fīhi, the ending -hi is a pronoun.
Katabtu is a verb with an attached pronoun; the whole word is not simply a pronoun.
In ḍarabat, the feminine -t is not the subject pronoun; when no overt subject follows, the subject is concealed.
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Pronouns: definitions, forms, usage, and parsing
Huwa and anā are nouns, not verbs. Fī is a preposition, not a pronoun; in fīhi, the ending -hi is a pronoun.
Katabtu is a verb with an attached pronoun; the whole word is not simply a pronoun.
In ḍarabat, the feminine -t is not the subject pronoun; when no overt subject follows, the subject is concealed.