Learning objectives
By the end of this lesson, you should be able to explain the rules, recognise the target forms in context, avoid common errors and apply the patterns to new sentences.
- Understand the core terms and distinctions.
- Study examples in complete sentences, not as isolated rules.
- Complete all 15 practice items before opening the answer key.
1. Sentence purpose
A declarative sentence makes a statement; an interrogative asks a question; an imperative gives a command or request; an exclamatory sentence expresses strong feeling. Punctuation normally reflects the purpose.
2. Simple sentences
A simple sentence contains one independent clause. It may have a compound subject or compound predicate and still be simple if it has only one independent clause.
3. Compound sentences
A compound sentence contains at least two independent clauses joined by a coordinating conjunction, a semicolon or another appropriate punctuation pattern. Use a comma before a coordinating conjunction joining independent clauses.
4. Complex and compound-complex sentences
A complex sentence has one independent clause and at least one dependent clause. A compound-complex sentence has at least two independent clauses and at least one dependent clause.
5. Clarity, fragments and run-ons
A dependent clause alone is usually a fragment in formal writing. Two independent clauses should not be joined with only a comma (comma splice). Avoid run-ons by using a conjunction, a full stop or a semicolon appropriately.
Guided practice
Try each item first. Then open the answer key and read the explanation for any answer you missed.
- “Where do you live?” is ___.
- “Please close the gate.” is ___.
- “What a beautiful flower!” is ___.
- “Mina sings and Rafi dances.” is structurally ___.
- “The boy ran home.” is structurally ___.
- “Because it was late, we left.” is structurally ___.
- A compound-complex sentence has at least two independent clauses and ___.
- Correct the fragment: “Although he was tired.”
- Correct the comma splice: “I was hungry, I ate.”
- “The sun set; the air grew cool.” is ___.
- A statement normally ends with a ___.
- “Turn left at the bridge.” is ___.
- “When the bell rang, the students left.” is ___.
- “I arrived, and she departed after lunch.” is structurally ___.
- A sentence with one independent clause and no dependent clause is ___.
Show answer key and explanations
- interrogative — It asks a question.
- imperative — It gives a request or command.
- exclamatory — It expresses strong feeling.
- compound — It has two independent clauses joined by and.
- simple — It contains one independent clause.
- complex — It has a dependent clause and an independent clause.
- one dependent clause — That is the defining combination.
- Although he was tired, he continued. — The dependent clause needs a main clause to complete the thought.
- I was hungry, so I ate. — Join independent clauses with a conjunction and suitable punctuation.
- compound — The semicolon joins two independent clauses.
- full stop (period) — Declarative sentences normally use a full stop.
- imperative — The subject you is understood.
- complex — When the bell rang is dependent; the students left is independent.
- compound — It contains two independent clauses; after lunch is a phrase.
- simple — That is the basic definition of a simple sentence.
Revision checklist
- I can explain the main rules in my own words.
- I can recognise the correct form in a complete sentence.
- I can explain why a common incorrect form is wrong.
- I can apply the rule to a new example.
If an answer was wrong, identify the rule behind the mistake and try writing two original examples.
Continue learning
← Previous chapterGrammar RoadmapGrammar Quiz LibraryNext chapter →Editorial note: Some grammar conventions vary by dialect or examination syllabus. Follow the terminology and conventions specified by your course or exam board where relevant.