Nouns by Declensions

Singular

Case (shows) 1st (Feminine) 2nd Masculine 2nd Neuter 3rd (vowel) 3rd (cons.)
Nom. (subject)

puella

servus

templum

leō

mercator

Gen. (possession)

puellae

servī

templī

leōnis mercatoris
Dat. (Indirect Obj.)

puellae

servō

templō

leōnī mercatorī
Accus. (Dir.Obj.)

puellam

servum

templum

leōnem mercatorem
Abl. (by/how)

puellā

servō

templō

leōne mercatore

Plural

Case (shows) 1st (Feminine) 2nd Masculine 2nd Neuter 3rd (vowel) 3rd (cons.)
Nom. (subject)

puellae

servi

templa

leōnēs

mercatorēs

Gen. (possession)

puellārum

servōrum

templōrum

leōnum

mercatorum

Dat. (Indirect Obj.)

puellīs

servīs

templīs

leōnibus mercatoribus
Accus. (Dir.Obj.)

puellās

servōs

templa

leōnēs mercatorēs
Abl. (by/how)

puellīs

servīs

templīs

leōnibus mercatoribus

Abbreviation key: Nom. (nominative), Gen. (genitive), Dat. (dative), Accus. (accusative), and Abl. (ablative).  Vocative and Nominative are usually the same except for 2nd declension masculine singular when the "us" ending changes to an "e" (ergo Marcellus becomes Marcelle (meaning "hey Marcellus!).

Declension Rhymes:

Feminine (1st) Singular: Adam And Eve Ate Evil Apples Monday Afternoon.

Masculine (2nd) Singular: Uncle Sam Is Out Until Monday O.k.

Neuter (2nd) Singular: Uncle Mike Is Out Until Monday O.k.

3rd Singular (ending in a consonant): Skip I Saw Ian Eat My Eggo.

3rd Singular (ending in a vowel): Nothing I Saw Ian Eat My Eggo.

These rhymes are simply to help you start to get the feel for the endings much as you sang your A, B, C's.  One would hope that you no longer have to sing your alphabet to figure out how to look up a word (at least not the whole alphabet).  I found it just as easy to to practice the endings going "a, ae, ae, am, a, ae, arum, is, as, is" et cetera.  Once you have it memorized then we can work on the accent (long) marks.

Remember the word order of a "normal" Latin sentence is likely to be "subject indirect object direct object verb" with ablative thrown in for good measure almost anywhere such as "Magister Rufum pilam cum manō pulsavit" ("The teacher hit the ball to Rufus with (his) hand").  When in doubt, look for clues, translating as best you can, such as order, prepositions like ad (acc.), cum (abl.), in (abl.), per (acc.), ex (abl.), or de (abl.).  See the page on diagramming to review.