Why is duo changed into duae feminiae, but tres remains unchanged?
Tres actually also changes, but only for the neuter: "tria". Unus, duo and tres are the only numerals that change.
There are or are there...both should be correct.
No, both should not be correct.
'There are three women" is a statement, while "Are there three women?" Is a question.
Is "Aren't there three women ?" also a correct translation ? If not, how would that be said in Latin ?
If the question is "Suntne tres feminae?", then what is the answer?
"Ita. Tres feminae sunt"?