Subject Complements & Linking Verbs

You know that slightly stuck feeling when a sentence looks finished but doesn't feel finished? "My sister is…" — is what? "The soup tastes…" — tastes like what? Nobody's left you hanging on purpose. It's just that some verbs don't push an action out into the world the way kick or write do. They sit there quietly, waiting for something to complete them.

Here's the thing — until somebody actually shows you this pattern, those finishing words get muddled up with objects, and you end up guessing in exams rather than knowing. Your teacher circles a word, writes "object?" in the margin with a question mark that helps nobody, and you're left wondering whether you've failed at something you were never properly shown in the first place. Let's be honest — that's not your fault. It's a gap in how this stuff usually gets taught.

So let's close that gap properly. This article does one job: it teaches you to spot linking verbs and the subject complements that follow them, and — this is the bit that trips up almost everyone — to tell a subject complement apart from a true object. Get that distinction solid, and a whole category of sentence-analysis questions stops being scary.

Before you read on, here's where we're heading. By the end you'll be able to: - Spot a linking verb and explain why it doesn't hand out an action to an object. - Identify subject complements — both the noun kind and the adjective kind. - Tell a complement apart from a true object, cleanly, every time. - Handle the trickier cases: verbs that switch jobs, and complements that stretch into phrases.

Beginner (Foundation)

Right. Let's start where every sentence starts — with the subject and the predicate. You already know the subject is who or what the sentence is about, and the predicate is what we say about it. Often that predicate is an action aimed at something: The dog chased the ball. "Chased" does something; "the ball" receives it. That receiving word is an object.

But — and here's where it gets interesting — some verbs aren't actions at all. They behave more like an equals sign. They join the subject to a word that finishes the thought about the subject, rather than describing something the subject did.

Look at these:

The sky is blue. My brother became captain. That joke sounds silly.

Nothing is being done to "blue," "captain," or "silly." They're not victims of an action — they're completing the picture of the subject. We call them subject complements. "Complement" just means completer. It finishes the job the linking verb started.

There are two flavours you'll meet constantly:

Predicate adjective — an adjective describing the subject:

The soup tastes delicious. The classroom feels cold.

Predicate noun (sometimes called a predicate nominative) — a noun renaming the subject:

Mrs Patel is our form tutor. My favourite subject is history.

Here's a trick that works every time: try slotting in a quiet mental equals sign. The soup = delicious. Mrs Patel = our form tutor. If that swap makes sense, you've found a subject complement.

The linking verbs you'll bump into most at this stage:

• Forms of be: is, am, are, was, were, been, being
• Become, seem, appear, feel, look, sound, smell, taste, remain, stay, get, grow — when they describe a state rather than an action.

Now — a fair warning, and this matters — not every use of feel or look is a linking verb. Sometimes they're proper action verbs. We'll sort that out properly in a moment. For now, just lock in the big idea: linking verbs need a completer, and that completer is a subject complement, not an object.

Common Mistake: Treating every word after a linking verb as an object because "it comes after the verb, so it must be one." In "My brother is tall," nothing is being done to "tall." It's a subject complement describing my brother. Objects get acted upon; complements just describe or rename.

Quick recap: - Linking verbs act like an equals sign; they don't push action onto an object. - A subject complement finishes the idea by describing or renaming the subject. - Predicate adjectives describe (soup = delicious); predicate nouns rename (Mrs Patel = form tutor). - Classic linking verbs: be, become, seem, appear, feel, look, sound, smell, taste, remain, stay, get, grow.

Intermediate (Development)

You've got the skeleton now. Time for the part that catches out almost everyone — including plenty of adults who never had this explained properly.

The decisive test

Compare these two sentences:

A. The coach made dinner. B. The coach became captain.

Both end in a noun. Only one of them is a subject complement.

In A, "dinner" is the thing that gets made — it receives the action. That's a true object. In B, "captain" is still the coach — nothing separate has been created or acted upon. The coach is the captain. That's a subject complement.

Two tests that'll get you there reliably:

1. The equals test. Can you put an equals sign between subject and finishing word without wrecking the sense? Coach = captain — yes. Coach = dinner — no, that's nonsense.
2. The passive test. True objects can often flip into the subject slot of a passive sentence: Dinner was made by the coach. You can't do that cleanly with a complement — "Captain was become by the coach" is gibberish, and that's exactly the point. It won't flip because it isn't an object.

Try both tests on some everyday school sentences:

The headteacher appointed Jordan. → "Jordan" is an object (Jordan was appointed). Jordan became head boy. → "head boy" is a complement (Jordan is head boy — no flipping possible). I saw the film. → object. I felt nervous. → complement — describes me. I felt the fabric. → object — I did something with my hands.

Same verb, feel, doing two completely different jobs depending on what follows it. That's the pattern to watch for.

Adjective, not adverb — the "feel bad" trap

Here's a classic mix-up. People sometimes say "I feel badly" when they mean "I feel bad." After a genuine linking verb, you want an adjective describing the subject's state:

I feel bad. She looks happy. The music sounds strange.

Save the adverb for when the verb is a real action — describing how something was done:

She felt carefully for the light switch in the dark. (manner of touching, not a state)

If you're describing how someone is, reach for the adjective. If you're describing how they performed an action, that's when the adverb earns its place.

More linking verbs, more colour

Don't stop at plain old be. Plenty of livelier linking verbs do exactly the same job:

She got frustrated with the revision app. The task proved impossible overnight. The corridor stayed silent after the bell.

Each finishing word — "frustrated," "impossible," "silent" — is still a subject complement. The verb's just wearing a more interesting coat.

Complements in your own writing

When you're writing a story, a science conclusion, or a PE evaluation, complements do a lot of quiet, unglamorous work:

The results were surprising. The mixture turned blue when we added the acid. My partner seemed unsure at first, but she soon became the strongest voice on the team.

Notice something: the whole business of matching is/are/was/were to the right subject and tense is a different lesson entirely — that lives with the verbs-and-tenses articles, not here. Your job in this concept is narrower and, honestly, simpler: check that whatever follows the linker genuinely renames or describes the subject rather than being something acted upon.

Pro-Tip: After look, feel, taste, smell, sound, ask yourself: "Am I describing a quality of the subject, or am I talking about an action done with eyes, hands, or tongue?" Quality → complement, adjective. Action onto something → object. That one question sorts nine out of ten confusing sentences.

Quick recap: - Use the equals test and the passive test to separate complements from objects, every time. - After a genuine linker, reach for an adjective (feel bad), not an adverb — unless you truly mean the manner of an action. - Livelier linkers — get, grow, turn, prove, stay, remain — still take subject complements. - The same verb (feel, look, smell) can be a linker or an action verb; what follows it tells you which.

Advanced (Mastery)

Once you can spot complements and objects without thinking twice, the finer questions start to appear — the ones that separate a good exam answer from a great one.

When the complement stretches into a phrase or a clause

A subject complement doesn't have to be a single word. It can be a whole chunk of sentence:

Her dream was to captain the netball team. (infinitive phrase) The trouble is that nobody locked the lab. (a noun clause) His only hope was winning the scholarship. (a gerund phrase)

Every one of those still renames or identifies the subject — the structure is just bigger. The full grammar of that middle example, the noun clause acting as a complement, belongs to its own dedicated lesson; for now, just recognise that clauses can sit in the complement slot exactly like single words can.

Subject complements versus object complements

Don't confuse these two cousins. Object complements come after objects of other verbs:

We elected Sam captain. (Sam = object; "captain" = object complement, describing what Sam became) Sam is captain. (no object at all; "captain" = subject complement)

Both are doing a "renaming" job — but one finishes the object, the other finishes the subject. This article's territory is the subject side.

Appositives are close relatives, not the same thing

My brother, the captain, scored twice.

"The captain" renames "my brother," but there's no linking verb doing the joining — it's just sitting next to the noun, wrapped in commas. That's an appositive, a different tool with a similar renaming habit. There's a full article on appositives if you want that pattern properly unpacked.

Register — why this matters beyond the exam

More formal writing often prefers a clean linking-verb frame over vague thrashing about:

Weak: A big thing about the experiment was weird results. Stronger: The results of the experiment were unexpected.

The complement structure keeps the focus squarely on identity and quality — genuinely useful in science write-ups, history explanations, and PE evaluations, where you're often saying what something is rather than what it did.

Edge cases that catch out strong writers too

• Sense verbs flip roles. She smelled the roses (action, object) versus The roses smelled sweet (linker, complement). Same verb, opposite jobs.
• Passive "be" isn't linking "be." He was elected captain uses "was" as part of the passive machinery, not as a pure linker — "captain" there behaves more like an object complement riding along on the passive. Keep the two bes in separate mental drawers.
• It is… constructions. It is unfair that we finished last — "unfair" is a subject complement of the dummy subject "it." The pattern holds even when the subject itself feels a bit like a placeholder.

And a dry note from someone who's marked a fair few essays: nobody ever gets marked down for writing "I feel bad." They sometimes get marked up for it, when the alternative — "I feel badly" — creeps in by mistake. Trust the adjective after a genuine linker.

Common Mistake: Writing "The soup tastes well" when you mean the soup has a good flavour. Food doesn't perform the action of tasting — it has a taste. You want "tastes good." Save "well" for describing how someone carries out an action.

Quick recap: - Complements can stretch into phrases and even whole clauses, not just single words. - Object complements rename objects; subject complements rename subjects — related jobs, different attachment points. - Appositives rename a noun by sitting beside it, without any linking verb involved. - Sense verbs and passive "be" both flip roles depending on structure — test the sentence, not the word in isolation. - Clean complement structures sharpen formal school writing by keeping focus on identity and quality.

UK vs US Note

The grammar here — linking verbs, subject complements, the whole pattern — works identically in UK and US English. You won't find a genuine grammatical difference anywhere in this article. The only thing that shifts is spelling in the odd surrounding word: colour [US: color], favourite [US: favorite]. The structure itself doesn't care which side of the Atlantic you're on.

Key Takeaways

• Linking verbs connect; they never push action onto an object.
• A subject complement either renames the subject (a predicate noun) or describes it (a predicate adjective).
• The equals test and the passive test will separate complements from objects reliably, every single time.
• After a true linker, reach for an adjective (feel bad), not an adverb, unless you genuinely mean the manner of an action.
• Complements can be single words, phrases, or whole clauses — the job matters more than the size.
• Object complements and appositives are close relatives of subject complements, but they attach differently — know the borders.

Check Your Understanding

1. In The hallway felt freezing, is "freezing" an object or a subject complement? How do you know?
2. Rewrite this sentence so that "captain" is a subject complement, not an object: They chose Maya captain.
3. Choose correctly: After the match I felt (bad / badly). Give a one-line reason.
4. Is The cake smells the vanilla well-formed, if you're describing the cake itself? Fix it if not.
5. Label each bold word as object, subject complement, or something else: a) We painted the door blue. b) The door is blue. c) Blue is my favourite colour [US: color].

Answer key

1. Subject complement — "felt" is linking here, and "freezing" describes the hallway. Try the equals test: hallway = freezing works fine; the passive test fails ("freezing was felt the hallway" is nonsense), confirming it isn't an object.
2. Maya became captain — or simply Maya is captain. A pure linking-verb sentence keeps "captain" firmly as a subject complement.
3. "Bad" — "feel" is acting as a linking verb, so it needs an adjective describing the subject, not an adverb describing an action.
4. No. If you're describing the cake, you want The cake smells of vanilla or The cake smells sweet — a genuine complement. "Smells the vanilla" forces an action-and-object reading, as if the cake were doing the smelling.
5. a) object complement (it describes the object "door" after the action verb "painted") b) subject complement c) subject complement (renames "Blue").

Related articles in this library

• 1.1 — Subjects, Verbs, and Objects (the basics this article builds straight on top of)
• 1.2 — Direct and Indirect Objects
• 1.4 — Sentence Patterns
• 3.4 — Noun Clauses (for the full story on clauses acting as complements)
• 6.3 — Appositives (for the renaming pattern that looks similar but works differently)

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