5.2: Proofreading for Grammar

Learning Objectives

1. Identify and correct sentence errors such as comma splices, run-ons, and fragments.

2. Identify and correct grammatical errors such as subject-verb and pronoun-antecedent disagreement, as well as faulty parallelism.

3. Identify and correct syntax errors such as misplaced modifiers.

4. Plan, write, revise, and edit short documents and messages that are organized, complete, and tailored to specific audiences.

Grammar organizes the relationships between words in a sentence, especially between the doer and action, so that the reader can understand in detail who’s doing what. When you botch those connections with grammar errors, however, you risk confusing the reader. Severe errors force the reader to interpret what you meant. If the reader then acts on an interpretation different from the meaning you intended, major consequences can ensue, including expensive damage control. You can avoid being a liability and embarrassing yourself by following some simple rules for how to structure your sentences grammatically. By following these rules habitually, especially when you apply them at the proofreading stage, not only will your writing be clearer to the reader and better organized, but your thought process may become more organized as well.

5.2.1: Sentence Errors

Readers who find comma splices, fragments, and run-on sentences lose confidence in the writer’s command of language and thus the quality of their work. Such giveaways suggest that the writer doesn’t know much about sentence structure and punctuation. This is especially bad coming from native English speakers in their 20s or older because it says that they still don’t understand the basics of their own written language even after decades of using it. It’s important to know what to look for, then, when proofreading your draft for sentence errors.

1. Comma Splices

A comma splice is simply two independent clauses separated by only a comma. Perhaps the error comes from writers thinking that, because the two clauses say closely related things, they need something a little “lighter” than a period to separate them. While separating them with a comma is certainly possible, doing so with a comma alone shows that the writer doesn’t fully understand what a sentence is and what commas do.

The sale begins on Saturday comma let's get there right at 9am.
Figure 5.2.1.1: A comma splice is a comma separating two independent clauses

Spotting a comma splice requires being able to identify an independent clause—i.e. the combination of a subject and predicate (noun + verb) that can stand on its own as a sentence (see §4.3.1 and §4.3.2). In the Figure 5.2.1.1 example above, the first independent clause’s subject is “The sale” and its predicate is “begins on Saturday” (sale + begins), so it can stand on its own as a sentence if it ended with a period. The second is an imperative clause (see Table 4.3.1 for more on imperatives) with the main verb being “let,” so it too can stand on its own as a sentence. When proofreading, be on the lookout for commas that have independent clauses on either side—that is, clauses that can stand on their own as sentences.

Fixing a comma splice is as easy as swapping out the comma for the correct punctuation or adding a conjunction, depending on the relationship you want to express between the two clauses. Altogether, you have four options in correcting a comma splice—two that replace the comma with other punctuation and two that leave it as-is but add a conjunction:

  • Replace the comma with a period to turn the two independent clauses into two sentences if each is a distinct enough complete thought. Don’t forget to capitalize the letter that followed the comma. Correcting the comma splice in the Figure 5.2.1.1 example would look as follows:

The sale begins on Saturday. Let’s get there at 9am.

  • Replace the comma with a semicolon to form a compound sentence if the two independent clauses are related enough to be in the same sentence:

The sale begins on Saturday; let’s get there at 9am.

If the writer wanted something a little lighter than a period to separate the two clauses, then a semicolon fits the bill.

  • Add a coordinating conjunction (e.g., and, but, so; see Table 4.3.2a for all seven of them) to form a compound sentence if it clarifies the relationship between the independent clauses:

The sale begins on Saturday, so let’s get there at 9am.

Note that if you see three or more independent clauses with commas between them and an and or or before the last one, then it’s a perfectly correct (albeit probably too long) compound sentence that combines whole clauses rather than just nouns or verbs. See the final example given in Comma Rule 4 below for a sentence organized into a list of clauses.

  • Add a subordinating conjunction (e.g., when, if, though, etc.; see Table 4.3.2a for more) to form a complex sentence (see Table 4.3.2b for more on complex sentences):

When the sale begins on Saturday, let’s get there at 9am.

Though each of the above comma-splice fixes is grammatically correct, the last two are best because adding a conjunction clarifies the relationship between the ideas expressed in the two clauses.

A common comma splice error involves “however” following a comma that separates two independent clauses. Consider the following sentence that are grammatically equivalent:

The company raised its rates, however, we were granted an exemption.

= The company raised its rates, however we were granted an exemption.

= The company raised its rates, we were granted an exemption.

Seeing that you have independent clauses on either side of the comma preceding “however” is easier if you imagine the sentence without both “however” and the comma following it, as in the third example sentence above. Fixing the error is as easy as replacing the comma preceding “however” with a semicolon and ensuring that a comma follows “however,” which is a conjunctive adverb (see Comma Rule 2 below):

The company raised its rates; however, we were granted an exemption.

This is somewhat tricky because “however” can be surrounded by commas if it’s used as an interjection between the subject and predicate (see Comma Rule 3 below) or between clauses in a complex sentence:

This particular company, however, had been delaying raising its rates for years.

With the company raising its rates, however, we had to apply for an exemption.

Because you see the first clause beginning with “With” in the second example, you know that it’s a dependent clause that will end with a comma followed by the main clause. It’s thus possible to add “however” where the comma separates the subordinate from the main clause.

When proofreading, be on the lookout for “however” surrounded by commas. If the clauses on either side can stand on their own as sentences, fix the comma splice easily by replacing the first comma with a semicolon. If one of the clauses before or after is a subordinate clause and the other a main clause, however, then you’re safe (as in this sentence). For more on comma splices, see the following resources:

2. Run-on Sentences

Whereas a comma splice places the wrong punctuation between independent clauses, a run-on (a.k.a. fused) sentence simply omits punctuation between them. Perhaps this comes from the second clause following the first so closely in the writer’s free-flowing stream of consciousness that they don’t think any punctuation is necessary between them. While it may be clear to the writer where one idea-clause ends and the other begins, that division isn’t so clear to the reader. The absence of punctuation will cause them to trip up, and they’re forced to mentally insert the proper punctuation to make sense of it, which is frustrating.

Spotting a run-on is easy if it’s just commas missing before coordinating conjunctions. If you string together the last couple of sentences concluding the above paragraph, for instance, and use conjunctions to separate the four clauses without accompanying commas, you’ll get a cumbersome run-on:

That division isn’t so clear to the reader and the absence of punctuation will cause them to trip up and they’re forced to mentally insert the proper punctuation to make sense of it and that’s frustrating.

“Run-on” is a good description for sentences like this because they seem like they can just go on forever like a toddler tacking on clause after clause using coordinating conjunctions (… and … and … and …). Though the above sentence would be perfectly correct if commas preceded “and” and “so,” adding further clauses would just exhaust the reader’s patience, commas or no commas. A run-on is not necessarily the same as a long sentence, then, as you can see with the perfectly correct 239-word sentence in Algonquin College’s Guide to Grammar and Writing page on run-ons (Darling, 2014). Such a long sentence can become convoluted, however, especially for audiences who may struggle with English such as ESL learners.

Sometimes spotting a run-on is just a matter of tripping over its nonsense. Say you’re reading your draft and then come across the following sentence:

We’ll have to drive the station is too far away to get there on foot.

You’re doing just fine reading this sentence up until the word “is” since, the way things were going, you probably expected a vehicle to follow the article “the.” Assuming “drive” is being used as a transitive verb (Simmons, 2007) that takes an object, “station wagon” would make sense. When you see “is” instead of “wagon,” however, you might go back and see if the writer forgot to put “to” before “station” to make “drive to the station.” That doesn’t make sense either, however, given what follows. Finally, you realize that you’re really dealing with two distinct independent clauses starting with a short one, and that some punctuation is missing after “drive.” The sentence is like a chain with a broken link.

Once you’ve found that missing link, fixing a run-on is just a simple matter of adding the correct punctuation and perhaps a conjunction, depending on the relationship between the clauses. Indeed, the options for fixing a run-on are identical to those for fixing a comma splice. Following the same menu of options as those presented above, you would be correct doing any of the following:

  • Add a period between the clauses (after “drive”) and capitalize “the” to form two sentences:

We’ll have to drive. The station is too far away to get there on foot.

  • Add a semicolon between the clauses to form a compound sentence:

We’ll have to drive; the station is too far away to get there on foot.

This is the easiest, quickest fix of them all.

  • Add a comma and coordinating conjunction to form a compound sentence:

We’ll have to drive, for the station is too far away to get there on foot.

  • Add a subordinating conjunction to form a complex sentence:

We’ll have to drive because the station is too far away to get there on foot.

Again, though each of the above run-on fixes is grammatically correct, only the last one best clarifies the relationship between the ideas expressed in the two clauses. For more on run-on sentences, see the following resources:

3. Sentence Fragments

A sentence fragment is one that’s incomplete usually because either the main-clause subject, predicate, or both are missing. The most common sentence fragment is the latter, where a subordinate clause poses as a sentence on its own, usually with its main clause being the preceding or following sentence. If the final example in §5.2.1.2 above were a fragment, it would look like the following:

We’ll have to drive. Because the station is too far away to get there on foot.

Recall from §4.3.2 that a complex sentence combines a main (a.k.a. independent) clause with a subordinate (a.k.a. dependent) clause, and the cue for the latter is that it begins with a subordinating conjunction (see Table 4.3.2a for several examples). In the above case, the coordinating conjunction “because” makes the clause subordinate, which must join with a main clause in the same sentence to be complete.

The fix is simply to join the fragment subordinate clause with its main clause nearby so that they’re in the same sentence. You can do this in one of two ways, either of which is perfectly correct:

  • Delete the period between the sentences and make the subordinating conjunction lowercase if the subordinate clause follows the main clause:

We’ll have to drive because the station is too far away to get there on foot.

  • Move the subordinate clause so that it precedes the main clause, separate the two with a comma, and make the first letter of the main clause lowercase:

Because the station is too far away to get there on foot, we’ll have to drive.

The same applies to sentences that begin with any of the seven coordinating conjunctions. These are technically fragments but can be easily fixed either by joining them with the previous sentence to make a compound. You could also change the conjunction to something else such as a conjunctive adverb like “However” for “but” or “Also” for “and” followed by a comma:

The station is too far away to get there on foot. But we’ll drive. The station is too far away to get there on foot, but we’ll drive. The station is too far away to get there on foot. However, we’ll drive.

You may also encounter fragments that are just noun phrases, verb phrases, prepositional phrases, and so on. Of course, we speak often in fragments rather than full sentences, so if we’re writing informally, such fragments are perfectly acceptable. Even in some formal documents, such as résumés, fragments are expected in certain locations such as the Objective statement (an infinitive phrase) and profile paragraph (noun phrases) in the Qualifications Summary.

If we’re writing formally, however, these fragmentary phrases are variations on the error of leaving sentences incomplete. The easy fix is always to re-unite them with a proper sentence or to make them into one by adding parts.

We thank you for choosing our company. As well as the impressive initiative you’ve taken. We thank you for choosing our company and are impressed by the initiative you’ve taken.
We thank you for choosing our company. You’ve shown impressive initiative.

The beauty of the English language is that there’s and endless number of ways to say something and still be grammatically correct as long as you know what makes a proper sentence. If you don’t, reviewing §4.3.1 and §4.3.2 above till you can spot the main subject noun and verb in any sentence, as well as tell if they’re missing. For more on fragments, see the following resources:

For exercises in spotting and fixing comma splices, run-ons, and fragments, see the digital activities at the bottom of the Guide to Grammar and Writing pages linked above (Darling, 2014a & 2014b), as well as Exercise: Run-ons, Comma Splices, and Fused Sentences (Purdue OWL, 2009).

5.2.2: Grammar Errors

Let’s focus on some of the most common grammar errors in college and professional writing:

1. Subject-verb Disagreement

Perhaps the most common grammatical error is subject-verb disagreement, which is when you pair a singular subject noun with a plural verb (usually ending without an s) instead of a singular one (usually ending with an s), or vice versa. Spotting such disagreements of number requires being able to identify the subject noun and main verb of every sentence and hence knowledge of sentence structure (see §4.3.1 and §4.3.2). The search for the main subject noun and verb is complicated by the fact that many other nouns and verbs in various phrase types can crowd into a sentence. The following subject-verb agreement (abbreviated “Subj-v Agr.”) rules help you know what to look for.

Quick Rules

Click on the rules below to see further explanations, examples, advice on what to look for when proofreading, and demonstrations of how to correct common subject-verb disagreement errors associated with each one.

Subj-v Agr Rule 1.1:

Singular subjects take singular verbs.

The first of many cuts is going to be the deepest.

Subj-v Agr Rule 1.2:

The indefinite pronouns each, either, neither, and those ending with -body or -one take a singular verb.

If each of you chooses wisely, someone is going to win the prize, but everybody wins because neither really loses.

Subj-v Agr Rule 1.3:

Collective nouns and some irregular nouns with plural endings are singular and take a singular verb.

The band isn’t going on stage until the news about the stage lighting is more positive.

Subj-v Agr Rule 2:

Plural noun, compound noun, and plural indefinite pronoun subjects take plural verbs.

The rights of the majority usually trump those of minority groups, except when money and politics conspire, and both usually do.

Subj-v Agr Rule 3:

Compound subjects joined by or or nor take verbs that agree in number with the nouns closest to them.

Neither your lawyers nor the justice system is going to be able to adequately punish this type of crime.

Subj-v Agr Rule 4:

The verb in clauses beginning with there or here agrees with the subject noun following the verb.

There are two types of people in the world, and here comes one of them now.

Extended Subject-Verb Agreement Explanations

 

For more on subject-verb agreement and how to correct disagreement, see the following resources:

2. Pronoun Errors

For more on pronoun-antecedent disagreements of number (e.g., Everybody has an opinion on this, but they are all wrong), ambiguous pronouns (e.g., The plane crashed in the field, but somehow it ended up unscathed—was the plane or field left unscathed?), and pronoun case errors (e.g., Rob and me are going to the bank—would you say “me is going to the bank”?), see the following resources:

3. Faulty Parallelism

For more on parallelism, see the following resources:

4. Dangling and Misplaced Modifiers

For more on dangling modifiers, see the following resources:

Key Takeaway

Writing sentences free of common grammar errors such as comma splices and subject-verb disagreement not only helps you avoid confusing the reader and embarrassing yourself, but also helps keep your own thinking organized.

Exercises

  1. Go through the above sections and follow the links to self-check exercises at the end of each section to confirm your mastery of the grammar rules.
  2. Take any writing assignment you’ve previously submitted for another course, ideally one that you did some time ago, perhaps even in high school. Scan for the sentence and grammar errors covered in this section now that you know what to look for. How often do such errors appear? Correct them following the suggestions given above.

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5.2: Proofreading for Grammar Copyright © 2019 by Andrew Stracuzzi and Brian Dunphy is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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