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TOEIC Link Part 5: prescribe versus proscribe

Prescribe and proscribe look almost identical but mean opposite things. Prescribe means to recommend or lay down as a rule; proscribe means to forbid or prohibit. Part 5 exploits the one-letter difference, so reading the slot for permission versus prohibition settles the choice faster than trusting the shape of the word.

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TOEIC Link Part 5: prescribe versus proscribe

Prescribe and proscribe differ by a single letter — a re versus a ro in the first syllable — and Part 5 counts on your eye sliding right past it. But the two verbs point in opposite directions: one lays something down as required, the other rules something out as forbidden. Once you read the slot for whether the sentence is telling you what to do or what not to do, the near-identical spelling stops being a trap. For the general discipline of letting meaning, not sound, decide these items, see word choice versus word form.

The core rule: require, or forbid

  • prescribe is a verb meaning to recommend, order, or lay down as a rule: The manual prescribes a specific approval sequence. / The doctor prescribed a two-week rest. Its object is the thing being required or authorized — a procedure, a treatment, a limit, a course of action. The related noun is prescription.
  • proscribe is a verb meaning to forbid, prohibit, or ban: Company policy proscribes the use of personal devices on the network. / The treaty proscribes the sale of these materials. Its object is the thing being ruled out. The related noun is proscription.

A memory hook: prescribe shares its start with prescription and prescribed rules — something set down in advance for you to follow. proscribe shares its pro with prohibit — something pushed away, banned. If the slot is about what is required, it is prescribe; if it is about what is banned, it is proscribe.

How to read the slot

  • A required action or standard → prescribe. When the sentence has the procedure, the dosage, the format, the deadline, the action is laying down a rule: The bylaws prescribe how directors are elected.
  • A forbidden action → proscribe. When the sentence has the use of, the sale of, access to, and the tone is a ban, the action is prohibiting: Regulations proscribe trading on inside information.
  • Test with a paraphrase. Try "lay down / require" — if it fits, choose prescribe. Try "forbid / ban" — if that fits instead, choose proscribe.

Common Part 5 traps

  • Policy and compliance passages favor proscribe. Sentences about what employees may not do — banned devices, prohibited transactions — point to proscribe. A prescribe distractor is the classic swap, but you cannot "require" something the sentence is clearly banning.
  • Procedure and standards passages favor prescribe. When the sentence spells out a required method, dosage, or format, the action is prescribing. A proscribe distractor reverses the meaning entirely.
  • Watch the surrounding negation. If the sentence already contains not permitted, strictly forbidden, or banned, the verb reinforcing that ban is proscribe. Read the direction of the rule before choosing.

Quick check

Decide which verb fits, then confirm with the "require" versus "forbid" test.

  1. The safety code (blank) that all machinery be inspected monthly.
  2. The new regulation (blank) the export of these components without a license.
  3. The style guide (blank) a consistent citation format for all reports.
  4. Federal law (blank) discrimination in hiring on these grounds.

Answers: 1. prescribes (laying down a requirement) — 2. proscribes (forbidding an export) — 3. prescribes (requiring a format) — 4. proscribes (forbidding discrimination).

The one-line takeaway

If the slot is about laying something down as required, it is prescribe. If it is about forbidding or banning something, it is proscribe. The one letter is the whole test — anchor it to the direction of the rule (required versus forbidden) and this question decides itself. For another pair where a single vowel flips the domain, review the reasoning pattern in elicit versus illicit, where the same read-for-meaning discipline breaks the tie.