The lesson focuses on adjectives, specifically their declensions and the concept of “tanween,” which involves the use of double vowels to indicate indefinite nouns in Arabic, such as double dhamma, double fatha, or double kasra. The session highlights the similarity between some Arabic and Maltese adjectives, providing examples like “zaki” (intelligent) and “ghabi” (stupid), and emphasizes the importance of these adjectives in both writing and speaking. Students are encouraged to note new vocabulary, particularly adjectives that describe people, places, and objects, to enhance their language skills.