Types of Sentences
Choose among and construct simple, compound, complex, and compound-complex sentences to signal different relationships among ideas, varying sentence patterns deliberately for meaning, interest, and style
What a learner can do afterwards
- Combine short sentences into a complex sentence using a subordinating conjunction for effect
- Rewrite a passage of monotonous simple sentences using a mix of sentence types for variety and flow
- Identify the sentence type (simple, compound, complex, compound-complex) of given examples and explain the effect of each
1 · Read
You have used main and subordinate clauses. Here, independent means main, and dependent means subordinate. An independent clause can stand alone: 'The torch glowed.' A dependent clause cannot stand alone as a complete sentence: 'Although the torch flickered' needs a main clause. Find the subjects and verbs, then test which clauses can stand alone.
A simple sentence has one independent clause and no dependent clauses. Several verbs can share its subject: 'Noor and Ben packed bags and checked the map.' This is still simple. A compound sentence has at least two independent clauses and no dependent clauses. Join them with a comma and a coordinating conjunction such as and, but or so, or with a semicolon. A comma alone cannot join two independent clauses correctly.
Two people and two actions can belong to one clause. Count clauses, not names or action words.
A compound sentence can have more than two clauses: 'The kettle whistled, the toast popped, and Dad poured tea.' Test each part: 'The kettle whistled', 'the toast popped' and 'Dad poured tea' can each stand alone. That gives three independent clauses. In this series, commas separate the clauses, and 'and' introduces the last one.
A complex sentence has one independent clause and at least one dependent clause. To build one, add because for cause, when or after for time, or although for contrast before a clause. Attach it to a main clause. Put a comma after an opening dependent clause. Dependent clauses can also follow the main clause. While can show two events happening together. A sentence can have more than one dependent clause: 'Before we left, I waited while Noor tied her boots.'
The main clause sits between two dependent time clauses.
A compound-complex sentence has at least two independent clauses and at least one dependent clause. In 'The crew waved while the ferry docked, and we walked aboard', 'The crew waved' and 'we walked aboard' are independent. 'While the ferry docked' is dependent, even in the middle. Count clauses instead of using sentence length. Relative clauses, which describe nouns, also count as dependent clauses.
The dependent clause does not have to come first.
Sentence type and length are different choices. Repeated short sentences can sound choppy, while repeated long ones can tire a reader. A short simple sentence after longer ones can add emphasis or tension. To revise, combine some ideas into a complex sentence and leave another simple, or split a long sentence. Keep every event, its timing and any stated cause or contrast. Choose joining words for the meaning you want.
Combine two simultaneous events with as or while: 'While Jo danced, I clapped. Ben sang at the same time.' 'While Jo danced' cannot stand alone, so it is dependent. 'I clapped' is independent. One independent clause with a dependent clause makes the first sentence complex. Use a comma after an opening dependent clause. 'Ben sang at the same time' has one independent clause and no dependent clauses, so it is simple. Keep every event and its timing.
A complex sentence followed by a simple sentence keeps all three events happening together.
Keep contrast with but and cause with so: 'Ice formed, but we skated. The sun warmed us, so we smiled.' Each has two independent clauses that can stand alone and no dependent clauses, so each is compound. Split 'When music stopped, we bowed' into 'Music stopped. We bowed then.' Each new sentence has one independent clause and no dependent clauses, so each is simple. Then preserves when we bowed. Keep every event and relationship.
But keeps contrast, so keeps cause, and then keeps the timing across two simple sentences.
Simple, compound, complex, and compound-complex sentences combine clauses in different patterns, so choose the pattern that fits the relationship you want to show.
Original sentence-structure lesson, revision examples, questions and flashcards written for this dataset.
Five original grammar readings written for this dataset, with new examples about clause counting, clause placement, meaning, rhythm and punctuation.
More to read
Count clauses, not action words
Read 'The gardener watered the beds and swept the path.' There are two actions, but they share the subject 'The gardener'. The sentence has one independent clause and no dependent clauses, so it is simple.
Now read 'The gardener watered the beds, and the visitors followed the path.' Each side of 'and' has its own subject and verb. Each can stand alone. With two independent clauses and no dependent clause, this sentence is compound.
A longer subject does not change the test. 'The gardener and the guide watered the beds' is still one independent clause. The subject names two people who share the action.
When naming sentence structure, find the clause units. Count the independent clauses and check for dependent ones. Counting people, action words or occurrences of 'and' on their own can give a different answer.
Find the dependent clause wherever it sits
Consider 'The crew checked the ropes while the ferry waited, and the passengers boarded.'
'While the ferry waited' tells when the rope check happened. It has a subject and a verb, but it cannot stand alone as a complete sentence. It is dependent.
'The crew checked the ropes' and 'the passengers boarded' can each stand alone. These are two independent clauses. Two independent clauses together with a dependent clause make this sentence compound-complex.
Move the dependent clause to the front: 'While the ferry waited, the crew checked the ropes, and the passengers boarded.' The opening dependent clause is followed by a comma. Moving it has not changed the clause counts or the sentence type.
Do the same checks when a sentence is long. Extra words do not establish a compound-complex structure. You still need at least two independent clauses and at least one dependent clause.
Check what the joining word says
The sentences 'The lights failed' and 'We stopped rehearsing' state two events. A joining word can make their relationship more explicit.
'We stopped rehearsing because the lights failed' names the failure as the cause of stopping. 'When the lights failed, we stopped rehearsing' tells when the stopping happened. It does not name the cause as directly.
Contrast gives a different message: 'Although the lights failed, we continued rehearsing.' The rehearsal continues despite the failure. This version changes what happened, so it would not preserve the two original facts.
Each combined sentence has one independent clause and one dependent clause. Each is complex, but their meanings differ.
Before combining sentences, decide which facts and relationships must stay. Check both the joining word and the events afterward. A sentence can be grammatical and still say something different from what you meant.
Give one event its own beat
Read 'While the hall grew quiet, the violinist raised her bow. She waited.' The complex sentence sets the scene. The short simple sentence gives the waiting a separate beat.
That effect depends on its surroundings. A short sentence after several longer ones can draw attention. A whole passage of equally short sentences may feel broken up instead. Long sentences can connect details, but repeating a long pattern may tire readers.
When revising, choose the event you want readers to notice. You could leave that event in a short sentence and combine some surrounding ideas. You could also split an overloaded sentence.
Read the revision aloud, then compare its meaning with the original. Keep the events, their timing and any stated reasons or contrasts. Changing rhythm is not a reason to remove information.
Choose a way to join complete clauses
'The bus stopped' and 'we stepped aboard' can each stand alone. One compound version is 'The bus stopped, and we stepped aboard.' A semicolon also joins the independent clauses: 'The bus stopped; we stepped aboard.'
A comma alone does not make that join: 'The bus stopped, we stepped aboard' is a comma splice. Add a suitable coordinating conjunction or use a semicolon to keep the two independent clauses in one sentence.
You can change the structure instead. 'When the bus stopped, we stepped aboard' has a dependent opening clause and one independent clause, making it complex. It states the timing of boarding.
Choose the join for the message. A semicolon links the clauses without naming a cause. 'Because' would name a cause. Check that any relationship added by your revision is one you intend to state.
2 · Watch
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Where it sits
Optional connections
Where this leads
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