Questions & Answers about Haec sententia iterum explicanda est.
Haec is the demonstrative this.
It is haec because it agrees with sententia, which is:
- feminine
- singular
- nominative
The demonstrative hic, haec, hoc changes form to match the noun it goes with.
So:
- hic = masculine nominative singular
- haec = feminine nominative singular
- hoc = neuter nominative singular
Since sententia is feminine singular, Latin uses haec sententia = this sentence / this opinion / this statement.