first declension noun endings

Question 1

nominative singular ending

Answer 1

-a

Question 2

accusative singular

Answer 2

-am

Question 3

genitive singular

Answer 3

-ae

Question 4

dative singular

Answer 4

-ae

Question 5

ablative singular ending

Answer 5

-a (long)

Question 6

nominative plural

Answer 6

-ae

Question 7

accusative plural

Answer 7

-as

Question 8

genitive plural

Answer 8

-arum

Question 9

dative plural

Answer 9

-is

Question 10

ablative plural

Answer 10

-is

Question 11

what case is puella?

Answer 11

nominative sing, ablative singular (long a)

Question 12

what case is puellarum?

Answer 12

genitive plural

Question 13

what case is puellam?

Answer 13

accusative singular

Question 14

what case is puellae?

Answer 14

singular: genitive, dative
plural: nominative

Question 15

what case is puellis

Answer 15

dative and ablative plural

Question 16

what case is puellas?

Answer 16

accusative plural

Question 17

what gender are first declension nouns and what is the exception?

Answer 17

feminine except nauta (sailor) - and probably some others - which is masculine
there is no neuter first declension

Question 18

what is the dative of dea and filia, and why is it that?

Answer 18

dea - deabus, filia - filiabus
it is to distinguish between the equivalent parts of deus and filius (voc - fili)