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Affixed pronouns, الضَّمَائِرُ الْمُتَّصِلَةُ
Affixed pronouns, الضَّمَائِرُ الْمُتَّصِلَةُ, are those attached to the end of a noun, a verb or a preposition.
Ex. حَيَاتُـهُمْ (their life)

• Affixed pronouns replace a noun already mentioned in the context, to avoid redundancy. If the sentence contains multiple nouns, the context will indicate the one replaced by the pronoun.
• Affixed pronouns agree in gender with the noun they replace.
  Ex. مَالِكُـهُ (its owner)

Note
The pronouns are affixed to nouns, verbs and prepositions, replacing always a noun that has already been mentioned in the context.