Questions & Answers about Scelus grave est.
Because scelus is neuter singular, and the adjective has to agree with it.
The adjective is gravis, grave = serious / heavy / severe.
Its nominative singular forms are:
- masculine/feminine: gravis
- neuter: grave
Since scelus is a neuter noun, Latin uses grave.
Here scelus is nominative singular, because it is the subject of est.
With a sentence like X est Y, the thing being described is normally in the nominative, and the describing adjective is also nominative:
- scelus = the subject
- grave = predicate adjective describing the subject
A beginner might notice that scelus could also look like an accusative form, because many neuter nouns have the same form in nominative and accusative. But in this sentence, the verb est shows that scelus is functioning as the subject, so nominative makes sense.