3rd declension explanation

Auris: M+F

1.       Group having the same no. Of syllables in case no. 1+2

-          1 Au – ris

-          2 Au – ris

-          1 Ca- na- lis

-          2 Ca- na- lis

2.       Group having two consonants before the ending –is (in gen; case no. 2)

-          1 dens

-          2 de –nt- is

-          1 pons

-          2 po-nt-is

-          1 ars

-          2 a –rt -is

All the other Latin  M+F belong to dolor!

Example of declension – see the genitive stem in bold which never changes in the paradigm , and
which is the basic part of all the forms (you get it when you take away the ending –is in genitive
= case 2):

SG                                                                         PL

1 caput N                                                           1 capit - a

2 capit – is                                                         2 capit - um

4 caput                                                                4 capit - a

6 capit – e                                                          6 capit – ibus

1 apex M                                                            1 apic - es

2 apic –is                                                            2 apic-um

4 apic – em                                                       4 apic - es

6 apic- e                                                              6 apic - ibus

+  see also the  explanation in the textbook skriptum_pdf_verze_brezen_2016.pdf, p.23