First declension F.
2nd declension masculine
SUM
2nd declension neuter
Miscellaneous
100

What does N, G, D, A, A stand for? 

Nominative, Genitive, Dative, Accusative, Ablative

100
what does es mean? 

you are

100

what are the 2nd declension neuter singular endings?

-um, -i, -o, -um, -o

100

o, s, t, mus, tis, nt

I, you, h/s/i/, we, you all, they

200

What does sunt mean?

they are

300

What are the 1st declension feminine plural case endings?

-ae, -arum, -is, -as, -is

300

present tense of sum

sum, es, est, sumus, estis, sunt

300

What are the 2nd declension neuter plural endings?

-a, -orum, -is, a-, is

400

What are the 2nd declension singular endings?

-us, -i, -o, -um, -o 

400

future tense of sum

ero, eris, erit, erimus, eritis, erunt

500

what are the 1st declension singular Feminine endings?

-a, -ae, -ae, -am, -a (long a) 
500

What are the 2nd declension masculine plural endings?

-i, -orum, -is, -os, is

500

Imperfect (past) tense of sum

eram, eras, erat, eramus, eratis, erant