TOEIC Link Part 5: Parallel Structure and the Lists That Test It

Parallel structure is one of the most reliable point sources in TOEIC Link Part 5, because the answer is sitting right there in the sentence. When two or more items are joined by a coordinating word — and, or, but, nor — they must all share the same grammatical form. The sentence shows you the pattern with the items it already gives you; your only job is to make the blank match.

This guide teaches you to spot the list, read the form that is already established, and supply a matching item — fast, and without re-parsing the whole sentence.

What "parallel" actually means

Parallel structure means that items in a series share the same part of speech or grammatical shape. If the first two items are nouns, the third must be a noun. If the first two are -ing verbs, the third must be an -ing verb. The coordinating word is the signal that a list exists and that all members must align.

Look at how the established items set the pattern:

The role requires planning, budgeting, and ( ).

The two given items are gerunds (planning, budgeting), so the blank must be a gerund — reporting, not to report or reports. You do not need to understand the sentence's meaning to know this. You only need to read the form of the items already in the list.

The trigger words

Train your eye to stop on these words, because each one almost always opens or continues a parallel structure:

• and — joins equal items (review and approve, fast and accurate)
• or — offers alternatives (by email or by phone)
• but — contrasts equal items (simple but effective)
• nor — continues a negative list (neither timely nor complete)
• not only … but also … — a correlative pair that must balance on both sides

When you see one of these, your first move is to find the items it connects and check that the blank fills the same slot in the same form.

Common parallel patterns tested

Verbs in a series must share tense and form:

Employees should save their work, log out, and ( ) the office. → lock (base verb, matching save and log)

Adjectives describing the same noun must all be adjectives:

The new interface is clean, fast, and ( ). → intuitive (not intuitively, not intuition)

Nouns in a list stay nouns:

The proposal covers cost, timeline, and ( ). → scope (not scoped)

Prepositional phrases must mirror each other:

The policy applies to full-time staff and ( ) contractors. → to (the second phrase must repeat the preposition structure)

Infinitives stay infinitives:

The goal is to reduce waste and ( ) efficiency. → to increase — or increase, but it must match the first half consistently

The correlative trap: not only … but also

Correlative conjunctions are the favorite trap of this question type, because they force balance across two halves of a sentence. Not only … but also, either … or, neither … nor, and both … and each demand that whatever follows the first half is mirrored by what follows the second.

The training was not only informative but also ( ). → engaging (adjective matching informative)

She is responsible not only for hiring but also ( ) onboarding. → for (the preposition must repeat: not only for … but also for …)

The classic error is putting the words in the wrong place so the two halves no longer match. Not only should be followed by the same kind of element as but also. If one side has a verb and the other has a noun, the structure is broken — and that broken version is exactly what a wrong answer choice will tempt you with.

How to solve one in seconds

1. Spot the coordinating or correlative word — and, or, but, nor, not only … but also.
2. Read the form of the item already given next to the connector — gerund, adjective, noun, infinitive, prepositional phrase.
3. Pick the choice that matches that form exactly. Ignore meaning; match shape.

This is a structure-first move, the same evidence-before-feeling habit that runs through every Part 5 category. It pairs naturally with knowing whether a question is testing meaning or form in the first place — if that distinction is still fuzzy, review word choice versus word form, because parallel-structure questions are almost always testing form, never meaning.

Why it pays off

Parallel-structure questions are gifts: the correct form is demonstrated for you elsewhere in the same sentence. You are never asked to invent the pattern, only to copy it. That makes them ideal for building speed — each one you answer by matching, rather than by re-reading, leaves more time for the genuinely harder items.

To keep widening your reliable-points base, pair this with the other mechanical Part 5 skills. The relative-clause decision path is just as systematic; if you have not drilled it, see relative pronouns and clauses. The more of these you turn into reflexes, the more of Part 5 becomes a matter of recognition rather than deliberation — and recognition is fast.