Questions & Answers about Sexta via longa est.
Because sexta is an adjective meaning sixth, and it has to agree with via.
Here, via is:
- feminine
- singular
- nominative
So sexta must also be:
- feminine
- singular
- nominative
That is why you get sexta via, not sextus via or sextum via.
Sex means six and is a cardinal number.
Sexta means sixth and is an ordinal number.
So:
- sex viae = six roads
- sexta via = the sixth road
English uses both kinds too:
- six roads
- the sixth road
Via is in the nominative singular here.
You can tell from the sentence structure:
- is the subject