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Public caselanguage-verb-check-001
Subject Verb Agreement
Check the student's sentence and identify the agreement error without merely approving it.
Tutor-visible context
Student context
Problem context
The subject is singular even though a nearby noun is plural.
Learning objective
Check the student's sentence and identify the agreement error without merely approving it.
Context window
Conversation history
No prior conversation. This case starts with the current student message.
Public boundary
What this page does not expose
This public development artifact intentionally excludes ground truth answers, known-misconception annotations, rubrics, and evaluator-only evidence. A future hidden challenge dataset must use the same fail-closed serialization boundary.