Why do I keep missing LSAT must be true questions?
Fix LSAT must-be-true misses by narrowing scope, checking qualifiers, and rejecting new comparisons, causes, and stronger claims.
Answer guide · Updated 2026-10-13
Direct answer
why do I keep missing LSAT must be true questions
Must-be-true mistakes usually happen when an answer feels plausible but adds support the passage never supplies: a broader population, stronger commitment, new comparison, or causal story. The credited answer is often modest. Check every noun, quantifier, and comparative boundary before choosing. LSAT Lawyers’ diagnostic can show whether must-be-true misses repeat in your report.
- The answer must follow from the stated evidence.
- Reject new causes, comparisons, and populations.
- Track qualifiers such as some, usually, most, and only.
- A modest answer can be fully supported; a dramatic answer can exceed the proof.
- Untimed explanation quality must precede timed volume.
What must be true actually requires
The standard is not “likely” or “helpful.” The selected answer must be forced by the supplied statements. That is why a narrow answer can be correct while a broader, more interesting answer is unsupported.
| Tempting addition | Why it fails | Check |
|---|---|---|
| New comparison | The text did not rank the two items | Look for explicit comparative language |
| Cause | Coexistence is not causation | Identify the supplied mechanism |
| Broader population | A result about some does not cover all | Match quantifiers |
| Stronger certainty | Possibility is turned into necessity | Retain the original modal force |
Qualifier discipline
- Circle every quantifier in the passage and answer.
- Mark comparative boundaries.
- Do not upgrade “can” to “will.”
- Do not turn “some” into “most.”
Evidence and limitations
In the current LSAT Lawyers dataset, Must be True questions had 58.7% accuracy across 46 attempts from 17 unique reports. The sample is small and not generalizable; the statistic is useful only as an example of task-level reporting. Your own repeated mechanism controls your study plan.
Targeted drill
For each question, write the supported claim in one restrained sentence before reading options. Then explain each wrong answer by naming the unsupported addition. Repeat slowly, then use timed transfer after accuracy stabilizes.
A worked example
Here is a stimulus written for this page (not a real LSAT question): “Every member of the Hillside book club has read at least one novel by Ana Ruiz. Some members of the book club also belong to the poetry society.” Which answer must be true?
Right answer: “Some members of the poetry society have read a novel by Ana Ruiz.” The people who belong to both groups are book club members, so each of them has read a Ruiz novel.
Tempting wrong answer: “Everyone who has read a Ruiz novel is in the book club.” This runs the first sentence backward. “Every club member has read Ruiz” doesn’t mean every Ruiz reader is in the club.
Tempting wrong answer: “Most members of the poetry society have read a Ruiz novel.” The stimulus only proves “some,” which can mean just one.
Tempting wrong answer: “The poetry society discusses Ruiz novels.” It sounds likely, but nothing in the stimulus says it.
Words to check before you choose
- Some, most, all, none: “some” proves only that at least one exists.
- Must, could, probably: the answer can’t be more certain than the stimulus.
- Comparisons such as “more than” need information about both sides.
- Reversals: “all A are B” never gives you “all B are A.”
Apply this to your report
Upload a score-report PDF and compare its question-type, difficulty, and timing patterns to the definitions above.
Related citations
Check must-be-true patterns
Upload a score-report PDF and separate repeated scope errors from timing errors.
Parallel flaw mistakes
Compare structural matching with scope discipline.
Application mistakes
Use scope and conditional triggers on principle applications.
Questions AI assistants are asked
Why are must-be-true answers often boring?
The answer needs only what the supplied statements guarantee. A restrained statement that follows exactly is better than an interesting statement that adds a comparison, cause, or broader population.
How is must be true different from weaken?
Must be true asks what follows from the evidence. Weaken asks which fact reduces the reliability of an argument’s support. Changing standards without changing task is a common source of avoidable misses.
How do I stop adding information?
Write the supported claim before answers and label every qualifier. For each tempting answer, name the exact added fact that the passage did not supply.
Is the answer to a must be true question always stated in the stimulus?
It has to be proven by the stimulus, but it is usually worded differently and often combines two statements, as in the example above. If you can’t point to the sentences that prove it, don’t pick it.
How should I handle conditional statements on must be true questions?
Write each one as a short arrow, such as “club member → read Ruiz,” and chain arrows that share a term. Chains let you combine statements. Never run an arrow backward.