Conditional reasoning runs through the scored LSAT, especially Logical Reasoning and Reading Comprehension. The challenge is that the test writers almost never hand you a clean "If A, then B." Instead, they bury conditional relationships inside dozens of different phrasings. This guide organizes every major conditional indicator into nine groups, with translations and real PrepTest references so you can drill each pattern.
Group 1: Sufficient Condition Indicators
These words introduce the sufficient condition—the trigger side of the conditional.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| If | If A → B | "If the council approves the plan, funding will follow." | Council approves → Funding follows | PT 52-S3-Q17 |
| When / Whenever | When A → B | "Whenever demand rises, prices increase." | Demand rises → Prices increase | PT 58-S1-Q9 |
| Every / Each / Any | All A → B | "Every licensed driver has passed a road test." | Licensed driver → Passed road test | PT 63-S2-Q4 |
| All | All A → B | "All participants signed waivers." | Participant → Signed waiver | PT 67-S3-Q12 |
| People who / Those who | A → B | "People who exercise regularly report better sleep." | Exercises regularly → Reports better sleep | PT 71-S1-Q20 |
Group 2: Necessary Condition Indicators
These words introduce the necessary condition—the requirement side.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| Only if | A → B | "The project will succeed only if funding is secured." | Project succeeds → Funding secured | PT 48-S4-Q22 |
| Must / Required / Necessary | A → B | "Passing the exam is required for certification." | Certified → Passed exam | PT 55-S1-Q16 |
| Depends on / Relies on | A → B | "Crop yield depends on adequate rainfall." | Good crop yield → Adequate rainfall | PT 60-S3-Q8 |
| Prerequisite | A → B | "Biology is a prerequisite for Anatomy." | Takes Anatomy → Took Biology | PT 74-S2-Q11 |
Group 3: "Unless" Family
These indicators mean "if not." Translate by negating the term and making it the sufficient condition.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| Unless | ¬A → B | "Unless the budget is approved, the project stalls." | ¬Budget approved → Project stalls | PT 53-S1-Q19 |
| Until | ¬A → B | "Until regulations change, emissions will remain high." | ¬Regulations change → Emissions high | PT 61-S2-Q7 |
| Without | ¬A → B | "Without evidence, the claim is unfounded." | ¬Evidence → Claim unfounded | PT 66-S3-Q14 |
| Except / Except if | ¬A → B | "The museum is open daily except on holidays." | ¬Holiday → Museum open | PT 70-S1-Q5 |
Group 4: Causal Indicators
Causal language often implies a conditional relationship: if the cause occurs, the effect follows.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| Causes / Leads to / Produces | Cause → Effect | "Prolonged sun exposure causes skin damage." | Prolonged sun exposure → Skin damage | PT 49-S2-Q13 |
| Results in / Gives rise to | Cause → Effect | "Deforestation results in habitat loss." | Deforestation → Habitat loss | PT 56-S4-Q6 |
| Is responsible for | Cause → Effect | "The new policy is responsible for reduced wait times." | New policy → Reduced wait times | PT 64-S1-Q18 |
Group 5: Value Judgments and Obligations
Normative language creates conditional-like structures linking conditions to obligations or permissions.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| Should / Ought to | Condition → Obligation | "Anyone who witnesses fraud should report it." | Witnesses fraud → Should report | PT 50-S3-Q21 |
| Must not / Cannot | Condition → Prohibition | "Employees must not disclose confidential data." | Employee → ¬Disclose confidential data | PT 59-S2-Q10 |
| Is entitled to / Has a right to | Condition → Permission | "Citizens who pay taxes are entitled to public services." | Pays taxes → Entitled to public services | PT 68-S1-Q15 |
Group 6: Probabilistic and Epistemic Indicators
These express likelihood or knowledge rather than certainty, but they still set up conditional reasoning on the LSAT.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| Likely / Probably | A → probably B | "Students who study consistently are likely to improve." | Studies consistently → Likely improves | PT 54-S1-Q23 |
| Indicates / Suggests | A → evidence for B | "High pollen counts indicate allergy season." | High pollen → Allergy season indicated | PT 62-S3-Q3 |
| Tends to / Is apt to | A → usually B | "Overwatered plants tend to develop root rot." | Overwatered → Tends toward root rot | PT 73-S2-Q9 |
Group 7: Biconditionals and Complex Structures
Biconditionals go both ways: A if and only if B means A → B and B → A.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| If and only if | A ↔ B | "A substance is an acid if and only if its pH is below 7." | Acid ↔ pH below 7 | PT 57-S4-Q2 |
| Vice versa / Conversely (in context) | A ↔ B | "Demand drives supply and vice versa." | Demand ↔ Supply (in context) | PT 65-S1-Q17 |
| Is equivalent to / Means the same as | A ↔ B | "Being a mammal is equivalent to being warm-blooded (in this model)." | Mammal ↔ Warm-blooded | PT 78-S3-Q8 |
Group 8: Conjunctions and Disjunctions
These link multiple conditions together or present alternatives.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| And / Both … and | A and B (conjunction) | "Both the director and the producer approved the script." | Director approved AND Producer approved | PT 51-S2-Q11 |
| Or / Either … or | A or B (inclusive unless stated) | "Either the lab or the field team collected the samples." | Lab collected OR Field team collected | PT 69-S1-Q20 |
| But not both | A or B, ¬(A and B) | "You may take Chemistry or Physics, but not both." | (Chem OR Phys) AND ¬(Chem AND Phys) | PT 75-S3-Q6 |
Group 9: Quantifiers
Quantifiers define how many members of a group the conditional applies to. Misreading scope here is one of the most common causes of wrong answers.
| Indicator Words | Logical Translation | Example Usage | Translation | PT ID |
|---|---|---|---|---|
| All / Every / Each | All A → B | "Every employee completed training." | Employee → Completed training | PT 46-S2-Q16 |
| Most | Most A → B (more than half) | "Most respondents preferred option A." | Most respondents → Preferred A | PT 53-S4-Q7 |
| Some / At least one | Some A are B (overlap) | "Some lawyers are also certified mediators." | Some lawyers = mediators (overlap) | PT 60-S1-Q14 |
| None / No | A → ¬B | "No student was excused from the final exam." | Student → ¬Excused from final | PT 72-S3-Q19 |
How to Use This Guide
Print or bookmark this page. When you encounter a conditional statement on a practice test, find the indicator in the tables above and write out the formal translation before evaluating the answer choices. After a few weeks of deliberate practice, the translations will become automatic and you will stop losing points to misread conditionals.