2.1 Sentence Writing

Common Sentence Errors

Fragments often occur because of some common error, such as starting a sentence with a preposition, a dependent word, an infinitive, or a gerund. If you use the six basic sentence patterns when you write, you should be able to avoid these errors and thus avoid writing fragments.

When you see a preposition, check to see that it is part of a sentence containing a subject and a verb. If it is not connected to a complete sentence, it is a fragment, and you will need to fix this type of fragment by combining it with another sentence. You can add the prepositional phrase to the end of the sentence. If you add it to the beginning of the other sentence, insert a comma after the prepositional phrase.

Example A

Incorrect: After walking two miles. John remembered his wallet.

Correct: After walking two miles, John remembered his wallet.

Example B

Incorrect: The dog growled at the vacuum cleaner. When it was switched on.

Correct: When the vacuum cleaner was switched on, the dog growled.

Correct: The dog growled at the vacuum cleaner when it was switched on. 

Clauses that start with a dependent word—such as since, because, without, or unless—are similar to prepositional phrases. Like prepositional phrases, these clauses can be fragments if they are not connected to an independent clause containing a subject and a verb. To fix the problem, you can add such a fragment to the beginning or end of a sentence. If the fragment is added at the beginning of a sentence, add a comma.

Incorrect: Because we lost power. The entire family overslept.

Correct: Because we lost power, the entire family overslept.

Correct: The entire family overslept because we lost power.

Incorrect: He has been seeing a physical therapist. Since his accident.

Correct: Since his accident, he has been seeing a physical therapist.

Correct: He has seeing a physical therapist since his accident. 

When you encounter a word ending in -ing in a sentence, identify whether or not this word is used as a verb in the sentence. You may also look for a helping verb. If the word is not used as a verb or if no helping verb is used with the -ing verb form, the verb is being used as a noun. An -ing verb form used as a noun is called a gerund.

Verb: I was working on homework until midnight.

Noun: Working on homework until midnight makes me tired the next morning. 

Once you know whether the -ing word is acting as a noun or a verb, look at the rest of the sentence. Does the entire sentence make sense on its own? If not, what you are looking at is a fragment. You will need to either add the parts of speech that are missing or combine the fragment with a nearby sentence.

Incorrect: Taking deep breaths. Saul prepared for his presentation.

Correct: Taking deep breaths, Saul prepared for his presentation.

Correct: Saul prepared for his presentation. He was taking deep breaths.

Incorrect: Congratulating the entire team. Sarah raised her glass to toast their success.

Correct: She was congratulating the entire team. Sarah raised her glass to toast their success.

Correct: Congratulating the entire team, Sarah raised her glass to toast their success.

Another error in sentence construction is a fragment that begins with an infinitive. An infinitive is a verb paired with the word to; for example, to run, to write, or to reach. Although infinitives are verbs, they can be used as nouns, adjectives, or adverbs. You can correct a fragment that begins with an infinitive by either combining it with another sentence or adding the parts of speech that are missing.

Incorrect: We needed to make three hundred more paper cranes. To reach the one thousand mark.

Correct: We needed to make three hundred more paper cranes to reach the one thousand mark.

Correct: We needed to make three hundred more paper cranes. We wanted to reach the one thousand mark.