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Simple, Compound, and Complex Sentences

Understanding sentence types: simple, compound, and complex

beginner

When to Use Simple, Compound, and Complex Sentences

  • •Simple: one independent clause. I like coffee.
  • •Compound: two independent clauses joined by and/but/or/so. I like coffee, and she likes tea.
  • •Complex: independent clause + dependent clause. I drink coffee because I'm tired.
  • •Compound-complex: two independent + one dependent. I drink coffee because I'm tired, and she drinks tea.
  • •Vary sentence types for better writing.

How to Form Simple, Compound, and Complex Sentences

Affirmative (+)

Simple: Subject + verb. Compound: Clause + , + FANBOYS + clause. Complex: Clause + subordinator + clause

Negative (-)

Same structures with negation

Question (?)

Same structures in question form

💡 FANBOYS: for, and, nor, but, or, yet, so. Subordinators: because, although, when, if, etc.

Examples of Simple, Compound, and Complex Sentences

✓I went to the store, and I bought milk.

✗I went to the store and, I bought milk.

Comma before the conjunction in compound sentences.

✓Because it was raining, I took an umbrella.

✗Because it was raining. I took an umbrella.

Dependent clause can't stand alone.

✓She sings well.

✗She sings well, and.

Simple sentence; no conjunction needed.

Common Mistakes with Simple, Compound, and Complex Sentences

💡 Practice Tips for Simple, Compound, and Complex Sentences

  • • Simple: one subject-verb pair, complete thought.
  • • Compound: two simple sentences joined by FANBOYS.
  • • Complex: independent + dependent clause.
  • • Comma before FANBOYS; comma after introductory dependent clause.
Quick Quiz
  1. 1.Which sentence is a correctly punctuated compound sentence? 
  2. 2.Which is a complete complex sentence? 
  3. 3.What kind of sentence is 'She sings well.'? 
  4. 4.Which letter is NOT one of the FANBOYS conjunctions? 
  5. Question 5: Add a conjunction to fix the comma splice: 'I went to the store, blank I bought milk.'
    5.Add a conjunction to fix the comma splice: 'I went to the store, I bought milk.'
  6. Question 6: Fix this fragment by adding the missing comma: 'Because it was raining blank I took an umbrella.'
    6.Fix this fragment by adding the missing comma: 'Because it was raining I took an umbrella.'
  7. Question 7: Identify the type (simple, compound, complex): 'I drink coffee because I'm tired.'blank
    7.Identify the type (simple, compound, complex): 'I drink coffee because I'm tired.'
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