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TOEIC Link Part 5: collaborate versus corroborate

Collaborate and corroborate look and sound similar but mean very different things. Collaborate means to work jointly with someone; corroborate means to confirm or support a claim with evidence. Part 5 exploits the near-identical spelling, so reading the slot for meaning — teamwork versus proof — settles the choice faster than trusting the shape of the word.

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TOEIC Link Part 5: collaborate versus corroborate

Collaborate and corroborate share seven letters, an identical rhythm, and the same co- opening, which is exactly why Part 5 pairs them. The trap is visual: your eye registers "co-…-orate" and stops reading. But the two verbs sit in completely different worlds — one is about people working together, the other is about evidence backing up a claim. Read the sentence for what is actually happening in the slot and the near-twin spelling stops mattering. For the broader habit of deciding these questions by meaning rather than sound, see word choice versus word form.

The core rule: work together, or confirm evidence

  • collaborate is a verb meaning to work jointly with another person or group on a task or project: The design team collaborated with marketing on the launch. / Researchers from three universities collaborated on the study. It typically takes with (a person) and on (a project). The related noun is collaboration and the adjective is collaborative.
  • corroborate is a verb meaning to confirm or give support to a statement, theory, or finding with evidence: The witness's account corroborated the manager's report. / New data corroborates the earlier hypothesis. Its object is usually a claim, story, account, or finding — not a person. The related noun is corroboration.

A memory hook: collaborate hides labor — people doing shared work. corroborate hides robor (from Latin robur, "strength") — you are strengthening a claim with proof. If the slot is about joint effort, it is collaborate; if it is about backing up evidence, it is corroborate.

How to read the slot

  • A person or organization as the partner → collaborate. When the sentence has with the vendor, with our overseas office, on the proposal, the action is joint work: We collaborated with an external agency.
  • A claim, report, account, or data as the object → corroborate. When the sentence has the testimony, the findings, the earlier report, the action is confirmation: Independent lab results corroborated the claim.
  • Test with a paraphrase. Try substituting "work together" — if it fits, choose collaborate. Try substituting "confirm with evidence" — if that fits instead, choose corroborate.

Common Part 5 traps

  • Business settings pull toward collaborate. Passages about teams, departments, and partners bias you toward joint-work vocabulary, so a corroborate distractor can feel wrong even when the object is a report or finding. Check the object, not the setting.
  • Legal, audit, and research contexts favor corroborate. Sentences about witnesses, evidence, audits, and studies point to confirmation. If the blank acts on a statement rather than a person, it is almost always corroborate.
  • Watch the preposition. Collaborate pairs with with / on; corroborate takes a direct object with no preposition. A following with a colleague strongly signals collaborate. This preposition logic mirrors the pattern in assure versus ensure, where the following structure locks the answer.

Quick check

Decide which verb fits, then confirm with the "work together" versus "confirm with evidence" test.

  1. The two firms agreed to (blank) on the new product line.
  2. Surveillance footage (blank) the security guard's statement.
  3. Our department regularly (blank) with the legal team on contracts.
  4. The auditor found no records to (blank) the reported figures.

Answers: 1. collaborate (joint work, on a project) — 2. corroborated (confirming a statement with evidence) — 3. collaborates (joint work, with a team) — 4. corroborate (backing a claim with records).

The one-line takeaway

If the slot is about people working together, it is collaborate. If it is about evidence confirming a claim, it is corroborate. Ignore the shared letters and read the object of the verb — that alone decides every version of this question.