Singular
Nominative- Castra
Genitive- Castrais
Dative- Castrai
Accusative- Castra
Ablative- Castri
Plural
Nominative- Castria
Genitive- Castrium
Dative- Castribus
Accusative- Castria
Ablative- Castribus
English
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Oh, decline. I thought it was translate.