Syntax: case constructions and non-finite forms
Interpret common case uses, infinitives, the ablative absolute, gerunds and gerundives.
Section SYNTAX-CASES · Case constructions and expressions
Exam scope and assessment notes
Original teaching foundations for the 2026–2028 syllabus. Six prescribed texts have passage-specific sequences; all 693 printed vocabulary rows have been reconciled into 692 distinct records, with additional number, comparison and compound-verb practice. Linked teaching and lexical self-checks do not certify mastery. Complete line-by-line annotation, further translation and scansion practice, qualified Latin-teacher review, full timed papers and human marking remain outstanding. Open the assigned edition alongside these lessons: public ancient texts can differ in spelling, punctuation or editorial readings from the prescribed prose anthology. Practice explanations are formative, not Cambridge questions, marks or predicted grades. Cambridge has announced withdrawal; the last assessment is June 2028, in administrative zones 3, 4, 5 and 6 only. Confirm entry with your centre.
Before you begin
- Read a short Latin sentence with a finite verb
- Check endings and vocabulary in context
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which evidence should you check first when a Latin sentence is unclear?
What you will learn
- Recognise the ablative absolute, partitive genitive, prolative infinitive and listed case uses.
- Distinguish gerunds and gerundives from finite verbs and ordinary adjectives.
Treat a construction as a unit
An ablative absolute usually pairs a noun or pronoun with a participle in the ablative and supplies a circumstance: time, cause or concession. The surrounding passage helps choose a natural English connection.
A partitive genitive identifies a whole from which a quantity or group is selected. Verbs with a dative or ablative and expressions of place, time, price and value must be learned with their construction.
Infinitives and verbal nouns have different jobs
A prolative infinitive completes a verb of ability, willingness or similar meaning. A gerund is a verbal noun; a gerundive is a verbal adjective and can express obligation in an appropriate construction.
Keep the finite verb as the clause's anchor. An infinitive or participle does not replace the main finite verb.
Sources for this lesson
Pause and explain
What does an ablative absolute usually contribute?
Worked example
Translate “Urbe capta, milites discesserunt.”
Show the worked solution
- Urbe and capta are both ablative singular.
- Together they form an ablative absolute.
- Discesserunt is the main finite verb.
Answer After the city had been captured, the soldiers left. The ablative absolute gives the circumstance; the main clause supplies the soldiers' action.
Try a topic test
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Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Translate “Hostibus victis, cives domum redierunt.”
Give me a hint
Find the ablative absolute and then translate the main clause.
Compare my reasoning
- Hostibus victis are both ablative plural.
- Redierunt is the main verb.
- Choose a sensible relation between victory and the return.
When the enemies had been defeated, the citizens returned home. Hostibus victis is the ablative absolute; the sequence supports a time relation.
Look for these in your work
- Recognises the construction
- Finds the main verb
- Produces a natural English clause
In “Discipuli libros legere volunt”, what does legere complete?
Give me a hint
Find the finite verb and its subject.
Compare my reasoning
- Volunt is the finite plural verb.
- Legere is an infinitive.
- The infinitive completes what the students want to do.
The students want to read books. Legere is a prolative infinitive completing volunt, not a second finite verb.
Look for these in your work
- Distinguishes finite verb and infinitive
- Matches the subject
- Explains the infinitive's role
A notice reads “Ars discendi difficilis est.” Explain the role of discendi.
Give me a hint
Check the genitive verbal-noun form after ars.
Compare my reasoning
- Discendi is a genitive form of the gerund.
- It depends on ars.
- Translate the relationship as a skill or art of doing something.
It means “the art of learning is difficult”. Discendi is a gerund functioning as a verbal noun in the genitive, dependent on ars.
Look for these in your work
- Recognises a gerund
- Identifies its case
- Gives a natural translation
Common mistakes
- Translating each ablative word separately
- Mistaking an infinitive for the main verb
- Assuming every gerundive has the same English wording
What can you explain now?
What does an ablative absolute usually contribute?
Compare with the explanation
A circumstance connected to the main clause
Context determines whether a time, cause or concessive link reads best.
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Make it stick
What does an ablative absolute usually contribute?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.