Anatomy
Understand the building blocks that give every sentence its structure, meaning, and power.
Subject
Who or what the sentence is about
Predicate
What the subject does or is
Direct Object
What receives the action
Modifier
Words that describe and refine
Adverb
How, when, where, or to what extent
Preposition
Showing relationships between words
Object of Preposition
The noun following a preposition
Subordinating Conjunction
Connecting dependent clauses
Verbals
Verb forms used as other parts of speech
Subject
The noun, pronoun, or noun phrase that a sentence is fundamentally about.
Definition
The subject is the person, place, thing, or idea that the sentence makes a statement about. It answers the question "Who or what is doing something — or being described?" Every complete sentence must have a subject.
Maria studies every evening.
Tom and Sarah enjoy hiking.
They arrived late.
The old oak tree fell overnight.
Predicate
Everything the sentence says about the subject — the verb and everything attached to it.
Definition
The predicate contains the verb and tells us what the subject does, is, or experiences. The simple predicate is just the verb; the complete predicate includes the verb and all its modifiers, objects, and complements.
The dog barked.
The dog barked loudly at the stranger all night.
The soup smells wonderful.
She walked to the store and bought milk.
Drag the words into the correct box:
Direct Object
The noun or pronoun that directly receives the action of the verb.
Definition
The direct object is a noun, pronoun, or noun phrase that answers the question "What?" or "Whom?" after an action verb. Only transitive verbs take direct objects — they must transfer their action to something.
The student read the novel.
The coach selected him.
She bought bread, milk, and eggs.
The baby slept. (No D.O.)
Modifier
Words, phrases, or clauses that describe, limit, or add detail to another word.
Definition
A modifier is any word or word group that makes the meaning of another element more specific or more vivid. Adjectives modify nouns; adverbs modify verbs, adjectives, and other adverbs. Phrases and clauses can also serve as modifiers.
The tired student yawned.
The student in the back row yawned.
The student who stayed up all night yawned.
Wrong: She almost drove her kids to school every day.
Right: She drove her kids to school almost every day.
Adverb
Words that modify verbs, adjectives, or other adverbs — telling how, when, where, or to what degree.
Definition
An adverb modifies a verb, adjective, or another adverb. Adverbs typically answer one of four questions: How? When? Where? To what extent/degree? Many (but not all) adverbs end in -ly.
How? → quickly, loudly, carefully
When? → now, yesterday, soon, always
Where? → here, there, nearby, everywhere
To what extent? → very, quite, almost, never
She spoke softly. (How?)
The test was extremely difficult. (To what degree?)
He ran incredibly fast. (How fast?)
She studied hard; therefore, she passed.
Preposition
Words that show the relationship between a noun (or pronoun) and another word in the sentence.
Definition
A preposition is a word that connects a noun or pronoun to another word to show relationships of time, place, direction, cause, or manner. Together with its object, a preposition forms a prepositional phrase.
The cat sat on the windowsill.
She arrived before noon.
They walked toward the lake.
He spoke with confidence.
Object of the Preposition
The noun or pronoun that follows a preposition to complete the prepositional phrase.
Definition
The object of the preposition (OP) is the noun or pronoun that follows a preposition, completing the prepositional phrase. The whole phrase (preposition + modifiers + object) functions as either an adjective or an adverb in the sentence.
She hid behind the door.
He sat next to her.
They left without saying goodbye.
I bought gifts for mom and dad.
Subordinating Conjunction
Words that connect a dependent (subordinate) clause to an independent clause.
Definition
A subordinating conjunction introduces a dependent (subordinate) clause and links it to an independent clause, showing how the two relate in time, cause, condition, contrast, or purpose. The dependent clause cannot stand alone as a sentence.
Although, After, As, While, When, Until, Before, Because, If, Since — and many more: unless, even though, provided that, so that, as if, wherever, whenever.
When the clock struck midnight, everyone cheered.
She left early because she felt ill.
If you study, you will succeed.
He smiled even though he was nervous.
Because she studied, she passed. ✓
She passed because she studied. ✓
Verbals
Verb forms that function as nouns, adjectives, or adverbs rather than as verbs.
Definition
A verbal is a word derived from a verb but used as another part of speech. There are three types: Gerunds (verb + -ing, used as nouns), Infinitives (to + verb, used as nouns/adjectives/adverbs), and Participles (verb + -ing/-ed/-en, used as adjectives).
Running every morning keeps him fit.
She enjoys reading historical fiction.
To succeed requires dedication.
Exhausted from the race, she sat down.
Your Results
Review your performance across all nine grammar concepts.
Every sentence has at least a subject and a predicate. The direct object receives the verb's action. Modifiers (including adjectives and adverbs) add detail and precision. Prepositions show relationships and must have objects. Subordinating conjunctions create dependent clauses. Verbals — gerunds, infinitives, and participles — allow verbs to function as other parts of speech.