English grammar rests on a set of core building blocks: parts of speech, sentences, clauses, and phrases. Getting comfortable with these terms now makes everything else in grammar click more easily. This guide covers the key terminology you'll need, from the eight parts of speech through sentence types, sentence components, and verb properties.
Grammatical Building Blocks
Fundamental Language Elements
Every word in English belongs to one of eight parts of speech. Here's a quick breakdown:
- Nouns name people, places, things, or ideas (teacher, city, freedom)
- Verbs express actions or states of being (run, think, is)
- Adjectives describe nouns (tall, blue, interesting)
- Adverbs modify verbs, adjectives, or other adverbs (quickly, very, almost)
- Pronouns replace nouns to avoid repetition (she, they, it)
- Prepositions show relationships between words, often involving location or time (in, on, before)
- Conjunctions connect words, phrases, or clauses (and, but, because)
- Interjections express emotion or reaction (wow, ouch, hey)
A sentence is a complete unit of thought. At minimum, it needs a subject and a predicate: The cat sleeps.
A clause is a group of words that contains both a subject and a predicate. Clauses come in two types:
- Independent clauses can stand alone as complete sentences: The rain stopped.
- Dependent clauses can't stand alone and need an independent clause to make sense: Because the rain stopped...
A phrase is a group of words that works together but lacks a subject-predicate pair. Phrases function as a single grammatical unit: in the park, under the table, running quickly.
Sentence and Clause Structures
There are four sentence types based on how clauses are combined:
- Simple sentence — one independent clause: She sings beautifully.
- Compound sentence — two or more independent clauses joined by a coordinating conjunction or semicolon: He plays guitar, and she sings.
- Complex sentence — one independent clause plus one or more dependent clauses: While I was sleeping, the phone rang.
- Compound-complex sentence — multiple independent clauses and at least one dependent clause: I enjoy reading books, but my sister prefers watching movies when she has free time.
A helpful way to remember: count the independent and dependent clauses, and the sentence type follows directly.
Sentence Components
Core Sentence Elements
- The subject is the doer or focus of the sentence, usually a noun or pronoun. In The dog barked loudly, the subject is The dog.
- The predicate tells you something about the subject. It includes the verb and everything that follows it. In The dog ran quickly through the park, the predicate is ran quickly through the park.
- Objects receive the action of the verb. A direct object answers "what?" or "whom?" (She threw the ball). An indirect object answers "to whom?" or "for whom?" (She gave her friend a gift — friend is the indirect object, gift is the direct object).
- Modifiers describe or limit other words. Adjectives modify nouns (the red car), and adverbs modify verbs, adjectives, or other adverbs (She spoke softly).
Advanced Sentence Structures
- Complements complete the meaning of a verb. A subject complement follows a linking verb and describes the subject (She is a doctor). An object complement renames or describes the direct object (They elected him president).
- Appositives are nouns or noun phrases placed next to another noun to give more information, often set off by commas: My sister, a talented musician, performs every weekend.
- Prepositional phrases start with a preposition and end with its object. They function as either adjectives or adverbs: The book on the shelf belongs to me. Here, on the shelf acts as an adjective describing book.
- Verbals are verb forms that function as other parts of speech. There are three types: participles act as adjectives (the running water), gerunds act as nouns (Swimming is great exercise), and infinitives can act as nouns, adjectives, or adverbs (To read is to learn).
Verb Properties
Temporal and Aspectual Features
Tense tells you when an action happens:
- Present: I walk
- Past: I walked
- Future: I will walk
Aspect tells you how an action relates to the flow of time. Each tense can appear in four aspects:
- Simple (I walk)
- Progressive (I am walking)
- Perfect (I have walked)
- Perfect progressive (I have been walking)
Voice describes the relationship between the subject and the action:
- Active voice — the subject performs the action: The cat chased the mouse.
- Passive voice — the subject receives the action: The mouse was chased by the cat.
Mood conveys the speaker's attitude or intention:
- Indicative states facts or asks questions (The sky is blue.)
- Imperative gives commands (Close the door.)
- Subjunctive expresses hypothetical or wished-for situations (If I were taller...)
- Conditional expresses possibilities dependent on a condition (I would go if I could.)
Grammatical Concordance
These are the agreement and consistency rules that keep sentences grammatically sound:
- Subject-verb agreement — the verb must match the subject in number and person. She walks (singular) vs. They walk (plural).
- Pronoun-antecedent agreement — pronouns must match their antecedent (the word they refer to) in number and gender. Each student must bring his or her own supplies. In modern usage, singular they is also widely accepted: Each student must bring their own supplies.
- Sequence of tenses — verb tenses in complex sentences should maintain logical time relationships. He said that he would come (not He said that he will come).
- Parallel structure — items in a list or comparison should use the same grammatical form. She likes swimming, hiking, and camping (all gerunds), not She likes swimming, to hike, and camping.