Questions & Answers about Debitum cras solvendum est.
The sentence has three main parts:
- debitum = the subject, the debt or what is owed
- cras = an adverb meaning tomorrow
- solvendum est = a gerundive + est construction, often called the passive periphrastic, expressing necessity or obligation
So the structure is basically:
The debt + tomorrow + must be paid
That is why the sentence is commonly understood as The debt must be paid tomorrow.
Here debitum is nominative singular neuter, because it is the subject of est.
A beginner may wonder whether it could be accusative, since neuter singular nominative and accusative often look the same. In this sentence, the syntax shows it is nominative:
- est needs a subject
- solvendum agrees with debitum
- together they form debitum ... solvendum est = the debt is to be paid
So even though the form could also be accusative in another context, here it is functioning as the nominative subject.