The jussive particles and nouns in Arabic conditional sentences in Classical and Modern Standard Arabic are a crucial aspect of Arabic grammar that has not been extensively explored. Focusing on the Qur'anic and al-Ḥadith corpora representing Classical Arabic, and the University of Leipzig corpora of Modern Standard Arabic, this book explores and compares frequency of occurrences of the particles and nouns of the jussive conditional sentences such as: ʾin, ʾidhmā, man, mā, ʾayyuhum, ʾayyu ḥīn, matā, ʾannā, ʾaina, and ḥaithumā in CA and MSA. The collocation and colligation phenomena of those particles and nouns are presented to understand and open up the expanse of the syntax construction of the jussive moods in conditional sentences in both Arabic variants. This corpus-based study reveals significant points in their usage and syntactic structures providing valuable insights into their main similarities and differences in both Arabic variants.