How Can You Tell What Case?
1. If the verb is sum, then the noun will be nominative.
2. If the noun follows a preposition, it can ONLY be acc. or abl.
acc.: ad, ante, apud, circum, contrâ, extrâ, inter, intrâ, per, post, prope, trâns
abl.: â/ab, cum, dê, ê/ex, prô, sine
2-way: in, sub
motion = accusative; at rest = ablative
3. If 2 nouns are side by side, one may be genitive of possession. (Ask yourself
whether one noun can belong in some sense to the other.)
4. A noun preceding an accusative noun (-m/-s) may be dative (indirect
object), especially if the verb is "give" or equivalent ("bring," "show").
5. If there is only one verb, the noun may possibly be nominative, BUT see #6.
6. If there is a subject with the verb, the noun is probably accusative.
7. If subject + verb + accusative (direct object), see #3 and #4.