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TOEIC Link Part 5: affect versus effect

Affect and effect sound almost identical but split cleanly by part of speech: affect is usually the verb "to influence," and effect is usually the noun "a result." Part 5 turns this into a word-form question disguised as a spelling one — the slot in the sentence tells you which word fits long before you weigh the meaning, so reading the surrounding structure is faster than trusting your ear.

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TOEIC Link Part 5: affect versus effect

Affect and effect are the classic English confusable pair, and Part 5 uses them to test something more precise than spelling: whether you can read part of speech from sentence structure. The two words split along a verb/noun line that holds in the large majority of test items. Once you know the slot in the sentence calls for a verb or a noun, you have the answer — you do not need to "hear" the difference, which is good, because the two are nearly impossible to tell apart by sound.

The core rule: affect = verb, effect = noun

  • affect (verb) means to influence or have an impact on: The new policy will affect every department.
  • effect (noun) means a result or consequence: The new policy had a positive effect on morale.

So the default mapping is: if the blank needs an action word (a verb), it is affect; if it needs a thing (a noun), it is effect. Reading the slot — verb position or noun position — is the same word-form skill tested across Part 5, the one covered in our guide to word form and part-of-speech recognition.

How to read the slot

You can almost always identify the part of speech from the words immediately around the blank, without weighing meaning at all.

  • After a subject and before its object, the slot is a verb, so affect. In Rising costs affect profit margins, the subject costs needs a verb next.
  • After an article or adjective, the slot is a noun, so effect. In The policy had a noticeable effect, the phrase a noticeable marks a noun slot.
  • After a preposition, the slot is a noun, so effect. In They studied the effect of the merger, the frame the ... of marks a noun slot.

Markers that force the noun effect: an, the, a, this, no, side, little, adverse, of. Markers that force the verb affect: a subject sitting in front of the blank with no determiner, modal verbs (will, can, may, would), or the infinitive marker to. In a plan to affect the outcome, the infinitive slot demands a verb.

The two exceptions Part 5 likes to test

The clean verb/noun split has two well-known reversals, and the exam knows them. Learn these so a correct answer that "looks wrong" does not throw you.

1. "effect" as a verb meaning "to bring about"

Effect can be a formal verb meaning to cause or implement, almost always in the fixed phrase effect change or effect a change:

The new director was hired to effect change across the organization.

Here effect is the verb, not affect, even though it sits in a verb slot. The tell is the object change and the meaning "bring about," not "influence." This phrase is the single most common trap version of the item.

2. "affect" as a noun in psychology

Affect can be a noun (stressed on the first syllable) meaning observable emotion or mood, used in clinical or formal writing:

The patient displayed a flat affect.

This sense is rare on TOEIC-style business content, but it explains why a noun slot occasionally takes affect. If the noun means "emotional expression," it is affect; if it means "result," it is effect.

A fast decision procedure

When a blank could be affect or effect, run it in this order:

  1. Read the slot. A determiner, adjective, or preposition before the blank points to a noun, so start with effect. A subject, modal, or infinitive before the blank points to a verb, so start with affect.
  2. Check for "effect change." If the verb slot is followed by change and means "bring about," switch to effect.
  3. Check meaning only if needed. "influence" points to affect; "result/consequence" points to effect.

Worked examples:

  • The weather may affect delivery times. — the modal may creates a verb slot, so affect.
  • Analysts measured the effect of the rate cut. — the frame the ... of creates a noun slot, so effect.
  • Management hopes to effect lasting improvements. — an infinitive slot, but the meaning is "bring about," so the "effect change" pattern applies and the answer is effect.
  • Side effects of the medication are mild. — the fixed compound noun side effects gives effects.

Don't let spelling lull you

Because the words are near-homophones, students who rely on pronunciation guess randomly. The reliable signal is structural, not phonetic: decide verb-or-noun from the slot first, then confirm meaning. That is exactly the discipline in word choice versus word form — knowing which question you are answering: here the "word form" reading (verb vs noun) settles most items before "word choice" (which meaning) ever comes up.

Quick reference

  • affect = verb ("to influence"): Costs affect margins.
  • effect = noun ("a result"): The effect was positive.
  • A determiner, adjective, or preposition before the blank points to effect (noun).
  • A subject, modal, or infinitive before the blank points to affect (verb).
  • Exception 1: effect change — effect as a verb meaning "bring about."
  • Exception 2: a flat affect — affect as a noun meaning "emotional expression."
  • Decide part of speech from the slot first; check meaning only to break ties.