EnglishBlitz
toeic-linkpart-5grammarword-choicevocabulary

TOEIC Link Part 5: ensure versus insure versus assure

Ensure, insure, and assure are all verbs that sound similar and overlap in meaning, which makes them a favorite Part 5 trap. Ensure means to make certain something happens. Insure means to protect with an insurance policy. Assure means to tell someone confidently so they stop worrying. The object of the verb — a thing, a risk, or a person — usually decides which one fits.

EnglishBlitz Team·

TOEIC Link Part 5: ensure versus insure versus assure

Ensure, insure, and assure are all verbs, all sound close, and all hover around the idea of "making something certain" — which is exactly why Part 5 uses them together. Unlike a clean verb-versus-noun pair, part of speech gives you nothing here; all three are verbs. The deciding factor is what the verb acts on: a thing or outcome, a financial risk, or a person. Once you read the object, the choice is almost forced. For the broader logic of questions decided by meaning rather than sound, see word choice versus word form.

The core rule: a thing, a risk, or a person

  • ensure means to make certain that something happens or is the case. Its object is usually an outcome, a clause, or a thing: Please ensure that all forms are signed. / The new process ensures consistent quality. Think "make sure."
  • insure means to protect against financial loss with an insurance policy. Its object is a thing of value or a risk: The company insures its inventory against fire. / All shipments are insured for full value. Think "insurance."
  • assure means to tell someone confidently so that they feel certain or stop worrying. Its object is almost always a person: The manager assured the client that the order would arrive on time. / I can assure you of our full support. Think "reassure a person."

A memory hook: assure has someone to address — it points at a person. Insure is about insurance. Ensure is the general "make sure" with no person and no policy.

How to read the slot

  • Object is a person (you, the client, them, customers) → assure. In we assure our customers, let me assure you, the verb is calming a person, so it is assure.
  • Object is a financial risk or insured item (against loss, for its value, against fire) → insure. In insure the equipment, insured against theft, money and policies are in play, so it is insure.
  • Object is an outcome or a "that" clause (that deadlines are met, accuracy, compliance) → ensure. In ensure that the report is accurate, ensure compliance, you are making an outcome certain, so it is ensure.

The fastest test: a person after the verb → assure; an insurance/loss context → insure; a "that"-clause or outcome → ensure.

Common Part 5 traps

  • ensure versus assure is the most-tested pair. Both can appear with similar phrasing, but assure needs a personal object and ensure does not. We want to ensure quality (outcome) versus we want to assure customers (person). Find the object before you choose.
  • British versus American is not the trap. In some varieties insure and ensure overlap, but TOEIC keeps them separate: financial protection is insure, making certain is ensure. Answer by the standard split.
  • "that" clause almost always means ensure. If the blank is followed by that + subject + verb, ensure is the safe default; assure takes a person first (assure someone that...).

Quick check

Decide which verb fits, then confirm with the object test.

  1. The supervisor will (blank) that every package is sealed before shipping.
  2. The firm (blank) its fleet of vehicles against accidents.
  3. The representative (blank) the buyer that a replacement was on its way.
  4. Double-checking the figures helps (blank) the accuracy of the report.

Answers: 1. ensure (outcome / "that" clause) 2. insure (protect against loss) 3. assure (a person, the buyer) 4. ensure (make an outcome certain).

The takeaway

Three similar-sounding verbs become easy once you stop listening and start reading the object: a person to calm is assure, a risk to cover is insure, an outcome to make certain is ensure. For more sets decided by meaning rather than sound, see complement versus compliment and economic versus economical.