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TOEIC Link Part 5: Word Form — Choosing the Right Part of Speech for the Blank

The most common Part 5 question type gives you four versions of the same word — a noun, a verb, an adjective, and an adverb — and asks which one fits. Learn to read the slot around the blank instead of the meaning, recognize the suffix signals, and answer word-form questions in seconds.

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TOEIC Link Part 5: Word Form — Choosing the Right Part of Speech for the Blank

The single most frequent question type in TOEIC Link Part 5 is the word-form question. The four answer choices are all built from the same root — for example succeed, success, successful, successfully — and only one part of speech fits the blank. These questions feel like vocabulary, but they are pure grammar. You do not need to know what the word means. You need to read the slot around the blank and decide whether it calls for a noun, a verb, an adjective, or an adverb. This guide shows you how to identify the slot on sight and which suffixes signal each part of speech.

The core idea: the blank has a job, not a meaning

When all four choices share a root, the test is not asking "do you know this word?" It is asking "do you know what kind of word goes here?" Look at what sits immediately before and after the blank, and the grammar will tell you the answer.

The project was a complete ( ). → success (noun, after a complete) The project was ( ). → successful (adjective, after was) The team ( ) completed the project. → successfully (adverb, modifying a verb) The team will ( ) if it stays on schedule. → succeed (verb, the main action)

Same root, four different slots, four different answers. Your task is to read the slot.

Suffix signals: how to recognize each part of speech

Most English words wear their part of speech as a suffix. Learn these and you can classify the choices before you even read the sentence.

  • Nouns often end in -tion, -ment, -ance, -ence, -ity, -ness, -ship, -al: information, management, performance, ability, readiness, approval
  • Adjectives often end in -able, -ible, -al, -ive, -ous, -ful, -ent, -ant: reliable, responsible, productive, generous, helpful, efficient
  • Adverbs almost always end in -ly: quickly, carefully, recently, significantly
  • Verbs are the base form or end in -ize, -ate, -en, -ify: organize, indicate, strengthen, clarify

When you see four choices, label each one by its suffix first. That turns the question into a matching task.

Slot 1: after an article or possessive → noun

If the blank follows a, an, the, this, our, their, or an adjective, it needs a noun.

We received their ( ) yesterday. → approval (noun) The company reported strong ( ) this quarter. → growth (noun)

A determiner or adjective is a signpost pointing at a noun. Nothing else can fill that slot.

Slot 2: after a be-verb or linking verb → adjective

If the blank follows is, are, was, were, become, seem, remain, it usually needs an adjective that describes the subject.

The new policy is ( ). → effective (adjective) Demand remained ( ) throughout the year. → stable (adjective)

The same is true when the blank sits before a noun: a ( ) decision → wise (adjective).

Slot 3: modifying a verb, adjective, or whole clause → adverb

If the sentence already has a complete subject and verb and the blank is "extra," it is almost always an adverb. Adverbs modify verbs, adjectives, and other adverbs.

The shipment arrived ( ). → late / promptly (adverb) Sales increased ( ) last month. → sharply (adverb) The report was ( ) detailed. → highly (adverb modifying the adjective detailed)

A quick test: if you can remove the blank and the sentence still works grammatically, you probably need an adverb.

Slot 4: the main action of the clause → verb

If the clause has no verb yet, the blank is the verb. Check whether there is already a conjugated verb in the clause — if not, the blank must supply it.

The committee ( ) the proposal next week. → will review / reviews (verb) Employees must ( ) the safety guidelines. → follow (verb, after the modal must)

After a modal (can, must, should, will), the blank is the base-form verb every time.

A two-step method for every word-form question

  1. Label the choices by suffix. Decide which is the noun, verb, adjective, and adverb before reading the sentence carefully.
  2. Read the slot, not the meaning. Find the word right before the blank — article, be-verb, modal, or nothing — and let it tell you which label fits.

This sequence keeps you out of the trap of choosing what "sounds right," which is where word-form questions catch people.

Watch out for these traps

  • Noun vs. adjective before a noun. In a ( ) report, you want the adjective (detailed), not the noun (detail). Two nouns in a row are possible (a compound), so confirm by meaning only when both are grammatically valid.
  • Adverb hiding between subject and verb. The manager ( ) approved the request → quickly (adverb). The slot between a subject and its verb is an adverb slot.
  • -ly adjectives. A few words ending in -ly are adjectives, not adverbs: friendly, costly, timely, likely. Read the slot to confirm.

Practice the recognition, not the words

Word-form questions reward a trained eye more than a large vocabulary. The goal is to glance at the four choices, sort them by suffix, then glance at the word before the blank and answer. To drill this until it is automatic, work through targeted Part 5 sets on EnglishBlitz and pair them with the broader parts of speech and sentence-slot guide. The more slots you see, the faster the suffix-to-slot matching becomes — until these questions take you only a few seconds each.

Summary

  • Word-form questions are grammar, not vocabulary: four choices, one root, one correct part of speech.
  • Sort the choices by suffix first (-tion noun, -able adjective, -ly adverb, -ize verb).
  • Read the slot: article → noun, be-verb → adjective, modal → verb, "extra" position → adverb.
  • Choose by the slot, never by what sounds right.