1st Declension Nouns

• 1st declension nouns are usually feminine, except for a few exceptions which can be masculine.
• The genitive singular of 1st declension nouns ends in -ae.
• The nominative plural ending for 1st declension nouns is -ae.
• The accusative plural ending for 1st declension nouns is -as.
• It's worth remembering that the ablative singular for 1st declension nouns ends in -ā.

2nd Declension Nouns

• 2nd declension nouns can be masculine or neuter.
• The nominative singular for masculine 2nd declension nouns usually ends in -us or -r, while for neuter nouns it ends in -um.
• The genitive singular for both masculine and neuter 2nd declension nouns ends in -i.
• The nominative and accusative plural for neuter 2nd declension nouns both end in -a.

3rd Declension Nouns

• 3rd declension nouns can be masculine, feminine, or neuter.
• The genitive singular form for all 3rd declension nouns ends in -is.
• The nominative singular can have many different endings, but it's always different from the base stem.
• The accusative singular typically ends in -em for masculine and feminine, and the nominative/accusative form for neuters ends in -e or -al.

4th Declension Nouns

• 4th declension nouns are usually masculine or neuter, with only a few exceptions which can be feminine.
• The genitive singular for both masculine and neuter 4th declension nouns ends in -ūs.
• The different forms in the nominative and accusative for masculine and feminine are typically -us and -um.

5th Declension Nouns

• 5th declension nouns are primarily feminine, with only a few exceptions which can be masculine or neuter.
• The genitive singular for 5th declension nouns ends in -ei.
• The different forms in the nominative and accusative for feminine and masculine are typically -es and -em respectively.
• The ablative singular ends in -e.