Rules
All nouns whose genitive form ends in -i belong to which declension
2nd
servus, servi
slave, servant
et
and
Preposition are followed by one of these two cases
Ablative and accusative
Christus gloriam Deo dedit.
Christ gave glory to God.
2nd declension nominative masculine ending
-us
filius, filii
son
bellum, belli
war
A Predicate Noun follows a linking verb and is in what case:
Christus filius est.
the same case as the subject - nominative
periculum, periculi
danger
2nd declension nominative neuter ending
-um
Deus, Dei
God
caelum, caeli
sky, heaven
Forms of this verb may stand anywhere in this sentence.
SUM (I am or to be)
imperium, imperii
command, power, empire
In all neuter nouns and adjectives, the accusative is always like which case
nominative
amicus, amici
friend
regnum, regni
kingdom, royal power
sed (part of speech)
but (conj)
dedit
dederunt
he, she, it gave
they gave
The dative case is this
indirect object
Christus, Christi
Christ
praemium, praemii
reward
gladius, gladii