Sentences come in different types. A simple sentence has one main idea ("The dog barked."). A compound sentence joins two simple sentences with a joining word like "and", "but" or "or" ("The dog barked, and the cat ran."). A complex sentence joins a main idea with a dependent idea that can't stand alone, often using words like "because", "although" or "when" ("The dog barked because it heard a noise."). Mixing sentence types makes writing more interesting to read.
Example
Simple: "It rained." Compound: "It rained, so we stayed inside." Complex: "Although it rained, we still went for a walk."
Key terms
Simple sentence:
A sentence with one main idea.
Compound sentence:
Two simple sentences joined by a word like "and", "but" or "or".
Complex sentence:
A main idea joined with a dependent idea using a word like "because" or "although".
Questions
1. A simple sentence has:
Two main ideas
One main idea
No verb
Only questions
2. A compound sentence joins two simple sentences using a word like:
Because
And
Quickly
The
3. Which is a simple sentence?
The dog barked.
The dog barked, and the cat ran.
Although it rained, we walked.
Because it was late, we left.
4. Which word could join a complex sentence?
And
But
Or
Because
5. "The dog barked, and the cat ran." is an example of a:
Simple sentence
Compound sentence
Question
List
6. "Although it rained, we walked." is an example of a:
Simple sentence
Compound sentence
Complex sentence
List
7. Mixing sentence types in writing mainly helps make it:
Harder to read
More interesting to read
Shorter
Incorrect
8. Which sentence is compound?
She studied hard.
She studied hard, but she was still nervous.
Because she studied hard, she passed.
She studied.
9. Which sentence is complex?
She left early.
She left early because she was tired.
She left early, and she went home.
She left.
10. Joining words like "and", "but" and "or" are used to build:
Simple sentences
Compound sentences
Complex sentences only
Questions
11. Joining words like "because", "although" and "when" are used to build:
Simple sentences
Compound sentences
Complex sentences
Lists
12. A sentence made only of "He ran." is:
Complex
Compound
Simple
Incomplete
13. Which sentence best combines two ideas using a compound structure?
She was tired. She kept working.
She was tired, but she kept working.
Tired, she kept working because.
She, tired, kept working.
14. Using only simple sentences throughout a whole piece of writing can make it feel:
Varied and engaging
Choppy and repetitive
Impossible to read
Grammatically incorrect
15. "Because it was raining, and the wind was strong, we cancelled the picnic." This sentence combines features of:
Only a simple sentence
A complex sentence with a compound element
No sentence type
A question
16. Which revision improves sentence variety in "She ran. She was tired. She stopped."?
She ran, she was tired, she stopped.
Although she was tired, she kept running until she finally stopped.
She Ran She Was Tired She Stopped
No change is needed.
17. A dependent clause (like "because it was raining") cannot stand alone as a sentence because it:
Has no verb
Doesn't express a complete thought by itself
Is too short
Contains no nouns
18. Which sentence is a run-on (incorrectly joined) rather than a correctly punctuated compound sentence?
She was tired, but she kept working.
She was tired she kept working.
She was tired; she kept working.
She was tired, so she kept working.
19. Skilled writers vary sentence types mainly to:
Confuse the reader
Control pacing and keep the reader engaged
Avoid using verbs
Make every sentence the same length
20. Which sentence correctly uses a complex structure to show cause and reason?
It was cold, so we stayed inside.
We stayed inside because it was cold.
We stayed inside, cold.
Cold, we, stayed, inside.
Answer key (parent copy)
1. One main idea
2. And
3. The dog barked.
4. Because
5. Compound sentence
6. Complex sentence
7. More interesting to read
8. She studied hard, but she was still nervous.
9. She left early because she was tired.
10. Compound sentences
11. Complex sentences
12. Simple
13. She was tired, but she kept working.
14. Choppy and repetitive
15. A complex sentence with a compound element
16. Although she was tired, she kept running until she finally stopped.