What is a sentence?
A sentence is a group of words that expresses a complete thought. It usually contains a subject (who or what) and a predicate (what the subject does or is).
Examples: The dog barked. She is happy.
What is a phrase?
A phrase is a group of words that works together as a unit but does not contain both a subject and a verb, so it cannot stand alone as a complete sentence. Phrases act as parts of speech (noun, verb, adjective, etc.).
- Noun phrase: the tall student, my new book
- Verb phrase: has been running, will go
- Prepositional phrase: on the table, after lunch
- Adjective phrase: very happy, extremely tired
Examples: The tall student smiled. (noun phrase = The tall student) She sat on the table. (prepositional phrase = on the table)
What is a clause?
A clause is a group of words that contains a subject and a verb. Clauses can be independent or dependent.
- Independent clause: Expresses a complete thought and can stand alone.
Example: He laughed. / The sun rose.
- Dependent (subordinate) clause: Cannot stand alone; it depends on an independent clause and often begins with words like because, when, if, who, which, that.
Example: because she was late / when the bell rang
Basic sentence components
- Subject: who or what the sentence is about (can be a noun, pronoun, phrase, or clause).
Examples: The dog, She, The tall student, Swimming, To travel, What he said.
- Predicate: tells what the subject does or is; always contains the main verb and may include objects, complements, and modifiers.
Examples: barked, reads books, became a teacher, has been working all day.
Four simple sentence types
1. Simple sentence
One independent clause (one subject + one predicate).
Example: The cat slept on the sofa. (Subject: The cat; Predicate: slept on the sofa.)
2. Compound sentence
Two independent clauses joined by a coordinating conjunction (for, and, nor, but, or, yet, so).
Example: I wanted to go, but it started raining.
3. Complex sentence
One independent clause + at least one dependent clause (dependent clauses often begin with because, when, if, who, which, that).
Example: I stayed home because I was tired.
4. Compound-complex sentence
At least two independent clauses and at least one dependent clause.
Example: Although it was late, we continued working, and we finished the project.
Common clause types (quick)
- Independent clause: can stand alone
Ex: He laughed.
- Dependent clause: cannot stand alone
Ex: because he was happy
Basic word order (SVO)
- Subject + Verb + Object.
Example: Maria (S) eats (V) apples (O).
- Forming questions often requires inverting the subject and an auxiliary verb:
Statement: You are ready.
Question: Are you ready?
Subjects — what counts
Subjects are not only nouns. A subject can be:
- Nouns: The teacher smiled.
- Pronouns: She smiled.
- Noun phrases: The tall teacher smiled.
- Gerund phrases: Writing helps me relax.
- Infinitive phrases: To learn is important.
- Clause subjects: What you did surprised me.
Predicates — what they include
The predicate always contains a verb (the main element) and may include:
- Objects: She reads books.
- Complements: He became a teacher.
- Modifiers: They have been working all day.
- Dependent clauses: I know that you are right.
Examples showing variety
- Simple verb: Birds sing(v).
- Verb + object: She reads(v) books(o).
- Verb + complement: He became(v) a teacher(comp).
- Verb phrase + modifiers: They (have been working) (all day).
- Verb + dependent clause: I remember that day.
Beginner practice activities
1. Build S + V + O sentences with these words: (They / play / football) → They play football.
2. Combine two simple sentences with and/but/or: Tom sings. Tom dances. → Tom sings and dances.
3. Make a complex sentence: He missed the bus. (add because) → He missed the bus because he woke up late.
4. Change statement to question: She can swim. → Can she swim?
Quick reference — examples at a glance
- Simple: The sun shines.
- Compound: I called her, and she answered.
- Complex: If it rains, we will stay inside.
- Compound-complex: Since he arrived late, I waited, and then we left together.
Tips for beginners
- Identify a clause by finding a subject + verb; if it expresses a complete thought it is an independent clause.
- Find the subject by asking Who? or What? before the verb.
- Find the predicate by locating the main verb and everything that follows that completes its meaning.
- Start with short sentences, then add phrases and dependent clauses to make longer sentences.
- Read sentences aloud to check whether they feel complete.