Jennie G. answered 05/30/19
Patient and Effective English, Latin, and Test Prep Tutor
Latin cognates with English like Curriculum and Syllabus take the nominative plural form in Latin to indicate the plural in English. For example, Curriculum is a second declension neuter noun in Latin, so the nominative plural ends in -a, Curricula. Syllabus is a second declension masculine noun in Latin, so the nominative plural ends in -I, Syllabi. These Latin plurals then become the plurals in English as well.