Some nouns that end in –sis are made plural by changing the –sis to –ses. Why is this?
A.
They have Greek origins and therefore have irregular plural forms.
B.
They have Latin origins and therefore have irregular plural forms.
C.
They have Spanish origins and therefore have irregular plural forms.
D.
There are no words that change forms like that in English.

Question

Some nouns that end in –sis are made plural by changing the –sis to –ses. Why is this?
A.
They have Greek origins and therefore have irregular plural forms.
B.
They have Latin origins and therefore have irregular plural forms.
C.
They have Spanish origins and therefore have irregular plural forms.
D.
There are no words that change forms like that in English.

whpalmer4 · Answer

One example of such a word would be basis (pl. bases).  Another would be axis (pl. axes).  Both come from Latin, though basis has earlier roots in Greek as well.