declension spellings

[KellyJo]

I have a simple question about spelling:

We are in the 5th chapter of Christiana (book 1) and I am having trouble figuring out how to spell the last 3 words in the declensions.

For example: (first declension)
aqua.....................aquae
aquae...................aquarum
aquae...................aquais....or maybe aquas or aquis??
aquarum................aquaas....or aquas??
aqua.....................aquais....or as noted above?

I am not sure how to make the changes when the word ends have vowels in them.

filia..........filiae
filiae........filiarum
filiae........filis?? or filiis?
filiam........filias??
filia...........filis??

Is there a simple rule that I am missing??
Thanks.
KellyJo

[CarolinaMom]

I believe the correct declension of aqua would be as follows:

aqua............aquae
aquae..........aquarum
aquae..........aquis
aquam.........aquas
aqua...........aquis

As for "filia," I checked several websites and this is what they all said:

Declension of filia

filia...........filiae
filiae..........filiarum
filiae..........filiabus
filiam.........filias
filia...........filiabus

It is irregular.

If you google "latin declension of filia" you can find them. If I'm wrong, someone please correct me. :o

Elizabeth in NC