TOEFL Read an Academic Passage: Vocabulary for Claims and Evidence

A passage says that one explanation for a population decline is habitat loss. It then reports a second study whose results are consistent with that explanation, although the researchers warn that disease may also have contributed.

A tempting summary is: “The second study proved that habitat loss caused the decline.” That answer keeps the topic but changes the evidence. The study supplied support, not proof, and the passage preserved another possible cause.

In TOEFL Read an Academic Passage, vocabulary is often a relationship problem. You need to know whether an author puts forward a position, adds evidence, weakens it, limits it, or draws a conclusion from it. The useful question is not “Can I use an advanced word?” It is “Which relationship does the passage actually establish?”

ETS currently describes Read an Academic Passage as a Reading task built around a short academic text. Questions address main ideas, supporting details, and important vocabulary. All necessary information is in the text, so outside knowledge should not replace close reading.

This is a recognition guide. You will not insert these words into a reading answer. You will use their boundaries to reject choices that make a passage more certain, more causal, or more critical than it is.

For wider preparation, visit the TOEFL vocabulary practice hub and the Exam English hub.

Build a claim-and-evidence map

Before looking at the answer choices, reduce a difficult paragraph to five possible roles:

Do not assume every paragraph contains all five. The map simply stops you from treating every sentence as another fact of equal status.

1. Contend: report a position without endorsing it

Contend that + clause means put forward a position that the source holds and argues for.

Some historians contend that the settlement was established primarily for trade.

The sentence attributes a view. It does not tell you that the view is correct, proven, or accepted by the passage author. Disagreement is common around a contention, but active disagreement is not required by the word itself.

Watch the frame. A person, group, document, or other source contends that something is true. In this sense, do not read contend with as a claim: communities contended with repeated floods means they coped with a difficulty. Contend for means compete for something.

Reading decision: if an option changes “the researchers contend that” to “the researchers demonstrate that,” it has increased the claim strength. The subject may believe the position strongly; the text still reports a position rather than establishing it.

2. Bear out: evidence supports an earlier claim

When results, observations, or records bear out a hypothesis, prediction, concern, or account, they confirm or support something that was previously uncertain or proposed.

Later pollen records bore out the hypothesis that the region had once been considerably wetter.

The evidence subject is records; the claim-like object is the hypothesis. The passive uses borne, not born: “The hypothesis was borne out by later records.”

This expression usually carries more confirming force than merely saying evidence is “consistent with” a claim. A small sample may support a hypothesis without being enough to bear it out. Let the passage determine the strength. The negative is equally important:

The excavation did not bear out the prediction that imported pottery would dominate the site.

That sentence says the evidence failed to confirm the prediction. It need not mean that the opposite has been proved.

Reading decision: identify the prior claim and ask whether the evidence genuinely does confirming work. If the passage calls the evidence limited, preliminary, or merely suggestive, an answer using proved or conclusively bore out probably goes too far.

3. Undermine: make a case weaker

Undermine + object means make confidence, credibility, authority, an argument, or an effort less strong or effective.

The absence of juvenile remains undermines the claim that the site was a permanent family settlement.

The missing evidence weakens the claim. It does not automatically destroy it. Nor does undermine require deliberate sabotage or gradual change. A single new result can undermine an explanation without anyone intending to weaken it.

Do not confuse undermine with underscore. Underscore draws attention to something; undermine weakens it. If a surprising result makes a methodological problem more noticeable, it may underscore that problem. If the result reduces confidence in the study’s conclusion, it may undermine the conclusion.

Reading decision: ask what becomes weaker. An option that says evidence “refutes” a theory may be too absolute when the paragraph says only that the evidence creates a problem for it.

4. Corroborate: add support to an existing account

Corroborate + object means support or strengthen an existing account, claim, or finding with evidence or authority.

A second set of tree-ring records corroborated the earlier temperature estimate.

The estimate already exists; another source strengthens it. A useful passive pattern is “the account was corroborated by the records.” Corroboration need not amount to conclusive proof, and the verb does not grammatically require legal independence.

Corroborate overlaps with substantiate, confirm, and support. Do not invent a universal one-word hierarchy. The clearest distinction arises when the passage explicitly describes the evidence state: additional evidence can corroborate an account already partly established; a claimant may need evidence to substantiate a previously unsupported assertion.

Reading decision: locate what was already known and what the new source adds. An answer that says a second source “introduced” a claim is wrong if the paragraph says it supported an earlier one.

5. Infer: move from evidence to a conclusion

To infer is to reach a conclusion from evidence, facts, wording, or patterns.

From the narrow growth rings, researchers inferred that the trees had experienced prolonged stress.

The pattern is infer X from Y or infer that + clause. The researchers infer; the evidence may imply or suggest. In careful edited English, keep that source–receiver direction clear.

An inference need not be certain or unstated. What matters is the evidence-to-conclusion move. A good reading inference is licensed by the passage, even if the author does not write the exact answer sentence. It cannot depend on facts you happen to know about the topic.

Reading decision: finish this sentence: “Because the passage states ___, a reader can reasonably conclude ___.” If you cannot fill the first blank with text evidence, the proposed inference is unsupported.

Worked passage: keep every relationship intact

Read this original paragraph:

For decades, researchers contended that the unusually thick shells of a coastal snail were primarily a defense against fish. Early aquarium experiments appeared to bear out this explanation: snails exposed to chemical traces from fish developed thicker shells. More recent field observations, however, found similarly thick shells at several sites where the relevant fish were rare. These observations undermine a fish-only explanation, but they do not show that predators have no effect. Measurements from the same sites indicate that stronger waves are associated with thicker shells. Because wave exposure and predator presence vary independently at some locations, researchers infer that both conditions may influence shell development. A later survey of twelve additional sites corroborated the association between wave exposure and shell thickness.

Now map it:

• Claim: earlier researchers contended that fish were the primary explanation.
• Initial support: aquarium experiments appeared to bear out that explanation.
• Challenge: thick shells also occurred where those fish were rare.
• Limit: this undermines a fish-only account; it does not eliminate a predator effect.
• Inference: both waves and predators may influence development.
• Additional support: a later survey corroborated the wave association.

Consider four possible answers to “What is the purpose of the field observations?”

A. To prove that fish have no effect on shell development

B. To challenge an explanation based only on fish

C. To corroborate the original fish-only explanation D. To show that thick shells cause stronger waves

Answer: B. The observations weaken the exclusive account. A contradicts the explicit limit, C reverses the relationship, and D reverses cause and evidence while adding a claim the paragraph never makes.

Common traps in academic-passage vocabulary

• Position becomes fact. Contends turns into establishes.
• Support becomes proof. Consistent evidence turns into a conclusive result.
• Weakening becomes destruction. Undermines turns into disproves even though the author preserves part of the explanation.
• Additional evidence becomes a new idea. Corroborates is read as introduces.
• Inference becomes outside knowledge. A plausible fact is chosen even though the passage provides no evidence for it.
• Association becomes causation. Two features occur together, so an option claims that one produces the other.

The vocabulary is useful because it exposes these changes. A wrong option often sounds intelligent precisely because it preserves the topic nouns. Check the relationship verbs.

Quick check

1. A review says, “The authors contend that seasonal flooding increased soil fertility.” Has the review confirmed the claim?
2. New records agree with and strengthen an account already supported by two sources. Can they corroborate it?
3. A result makes one explanation less convincing but leaves it possible. Can it undermine the explanation?
4. A reader reaches a conclusion from two details in the passage. Is the reader inferring?
5. A tiny study is described as preliminary and only consistent with a theory. Must it have borne out the theory?

Answers: 1. No. Contend reports a position. 2. Yes. The records add support to an existing account. 3. Yes. Undermining is weakening, not necessarily refutation. 4. Yes, provided those details support the conclusion. 5. No. The description preserves weaker evidential force.

Fresh practice item

Read this two-sentence passage:

One model proposes that the birds navigate mainly by detecting Earth’s magnetic field. Cloudy-sky trials produced similar route accuracy to clear-sky trials, but the sample was small and the researchers said the result should be treated cautiously.

Which statement is best supported?

A. The trials conclusively bore out the magnetic-field model.

B. The trials undermined every explanation of bird navigation.

C. The result is consistent with the model, but its evidential force is limited. D. The researchers contended that clouds cause route accuracy.

Answer: C. It preserves both the relevant result and the explicit caution. The other choices add conclusiveness, total rejection, or a causal claim.

Sources

• TOEFL iBT Reading section
• Updated TOEFL iBT Test Overview

Related

• TOEFL vocabulary list 2026 by task
• TOEFL Complete the Words vocabulary in context
• Why a TOEFL word list won't raise your writing score
• IELTS vs TOEFL vocabulary

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