Concise answer
GRE reading questions cluster into a few recurring jobs — main idea, inference, strengthen/weaken, author's purpose — and all of them are answered from the passage's structure and text alone: map what each part of the passage is doing, keep the author's own position separate from positions merely reported, and demand explicit passage support for every answer you select.
Definitions
- Passage structure
- The skeleton of a passage — which sentences state claims, which give evidence, which raise objections, and which reply — as distinct from the details that flesh it out.
- Inference question
- A question whose answer is not stated verbatim but must follow from what the passage says; a correct inference is compelled by the text, not merely consistent with it.
- Author's purpose
- What the passage or a cited portion of it is doing — arguing, reporting a debate, qualifying a claim — which can differ from what any speaker inside the passage believes.
Intuition
The passage is a closed world: every credited answer is defensible from its text alone, so outside knowledge is never required and often harmful — a choice can be true in the real world and still wrong because the passage never commits to it.
Details are stored in the passage and can be looked up; structure must be understood, and it is what the questions actually probe. If you can say what each sentence is doing — claiming, supporting, objecting, replying — the main idea, the author's purpose, and most inferences are already in hand.
Concept walkthrough
The format, per ETS: about half the Verbal Reasoning measure is reading passages and answering questions on them, with passages mostly one paragraph long (one or two run longer) and roughly one to six questions each. Three answer formats appear: standard multiple choice with a single answer, multiple choice where one or more choices may be correct and every correct choice must be selected, and select-in-passage, where the answer is a sentence you click in the passage itself.
Whatever the format, the questions keep assigning the same few jobs. Main-idea questions ask what the passage as a whole establishes — the top of the structure, not its most memorable detail. Inference questions ask what must follow from the text; the right answer is compelled by specific sentences, and a choice that is merely plausible or true-in-general fails that test. Strengthen/weaken questions treat an argument in the passage as a target and ask which new fact would support or undermine the link between its evidence and its conclusion. Purpose questions ask what the author is doing — and since a passage can report a debate without joining it, ETS's advice to separate ideas the author endorses from ideas merely reported is often the whole question.
This is why reading for structure beats reading for detail. On a first pass, tag what each sentence or paragraph is doing — claim, evidence, objection, reply — and do not memorize the details; they stay on screen and can be relocated when a question actually asks for them. When you answer, follow ETS's tips as a discipline: read every choice, pick the one that most accurately and most completely answers the question asked, and require explicit passage support. A choice that needs your own expertise to be true, or that overreaches what the text commits to, is wrong no matter how reasonable it sounds.
After this page, you should be able to
- Name the three Reading Comprehension answer formats and the recurring question jobs: main idea, inference, strengthen/weaken, and author's purpose.
- Map a passage's structure — claim, evidence, objection, reply — in a few words per paragraph before answering.
- Separate the author's own position from positions the passage merely reports, and answer purpose questions from that separation.
- Justify an answer by pointing to passage text, and reject choices that rely on outside knowledge or say more than the passage supports.
Formulas and assumptions
Answer-selection test
Variables
- passage-supported: every part of the choice can be justified by pointing at passage text, with no outside knowledge
- answers the asked question: the choice does the job the question stem assigns (main idea, inference, strengthen/weaken, purpose)
Assumptions
- A choice failing either conjunct is wrong even if it is a true statement.
- In the one-or-more-answers format, apply the test to each choice independently and select every choice that passes.
Worked example
Mapping a short passage's structure before answering
Passage: "A common argument holds that urban bike lanes ease congestion by drawing commuters out of cars. In several cities, however, congestion initially worsened after road space was reallocated to new lanes. Advocates reply that such early comparisons are premature: shifts in how people commute unfold over years, so first-year congestion figures reveal little about a lane network's eventual effect." Question: The primary purpose of the passage is to (A) argue that bike lanes ultimately reduce urban congestion (B) present an objection to a claim and a response to that objection (C) demonstrate that early congestion data prove bike lanes ineffective (D) recommend that cities delay building bike lanes (E) reconcile two conflicting studies of commuter behavior
- 1Map the structure sentence by sentence: sentence 1 reports a claim ("A common argument holds"), sentence 2 raises an objection to it ("however, congestion initially worsened"), sentence 3 reports the advocates' reply ("Advocates reply").
- 2Separate the author from the speakers: the author attributes every position — the argument, the objection's data, the reply — and never endorses one side in their own voice.
- 3Test (A) against the text: the passage nowhere asserts that bike lanes ultimately reduce congestion; that is the advocates' implied position, merely reported. Reject.
- 4Test (C) and (D): the reply explicitly disputes that first-year figures settle anything, and no sentence recommends any action, so both overreach the text. Reject; (E) fails because no studies are being reconciled.
- 5Test (B) against the map: claim, objection, reply — "present an objection to a claim and a response to that objection" matches the structure exactly, and every word of it is justified by passage text alone.
(B): the passage presents an objection to a claim and a response to that objection.
Common traps
- Answering from outside knowledge or general plausibility — a choice can be true in the real world and still wrong because the passage never supports it.
- Selecting a choice that is a true statement about the passage but does not answer the question asked, or one that quotes the passage's words while distorting its logic.
- Attributing a reported position to the author — a passage that presents a debate has an author whose purpose is to present, not to take sides.
- Favoring extreme or overreaching wording ("proves," "never," "all") when the passage commits only to a qualified version, and forgetting that the one-or-more-answers format requires every correct choice, not just one.
Related pages and practice
Question depth and domain coverage vary by exam. Practice answers are checked after submission.
Sources
- GRE General Test Verbal Reasoning Overview — ETS. Accessed 2026-08-03. Use as a cited source for exam facts; do not imply affiliation or reproduce protected test material.
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Recheck the ETS Verbal Reasoning content page, including its Reading Comprehension question-type description and tips, before each major GRE preparation cycle.