Common Sentence Errors
● APU Writing Center ● (626)815-6000 ext.3141 ● apu.edu/writingcenter ● apu.mywconline.com ●
As crazy, long, interesting, and complicated as sentences can be, a proper sentence contains two key components:
a subject and a predicate.
A subject is like the main character of a sentence: it is the person, place, or thing that all of the
action revolves around. It receives or does the action.
A predicate is the plot of the story and contains everything that happens to or because of
the subject. In simple sentences, the predicate is the verb. For example, in the sentence
below, Bob is the subject and sat is the predicate:
Bob sat.
All sentences have a subject and a predicate, making each sentence like a tiny story – a unit that makes sense by
itself. Most sentence errors occur when this basic unit is disrupted. This handout focuses on three common
sentence errors and suggests a variety of ways to correct them.
Common Sentence Error #1: Comma Splices
A comma splice occurs when a comma is used to link two independent sentence units (with their own subjects
and predicates) that are fully capable of standing on their own.
Example: We always eat at In ‘N’ Out, they prefer Burger King.
In this example, both “We always eat at In ‘N’ Out” and “they prefer Burger King” are complete, independent
sentences. Each makes sense on its own and includes both a subject (we, they) and a predicate (eat…,
prefer…).
This common sentence error can be corrected in a variety of ways…
Option #1: Divide the splice into two separate sentences using a period.
Example: We always eat at In ‘N’ Out. They prefer Burger King.
Option #2: Connect the two spliced segments with a coordinating conjunction: for, and, nor, but, or, yet, so.
Example: We always eat at In ‘N’ Out, but they prefer Burger King.
Option #3: Connect the spliced sections using a semi-colon, which can join related sentences.
Example: We always eat at In ‘N’ Out; they prefer Burger King.
Option #4: Link the spliced sections with a subordinating conjunction: although, while, as, since, though, etc.
Example: Since we always eat at In ‘N’ Out, they prefer Burger King.
Example: We always eat at In ‘N’ Out although they prefer Burger King.
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