Avoiding Faulty Comparisons — I can avoid faulty comparisons by ensuring comparable items are compared.

Language has always been about making meaning clear. When we compare two things, we want our reader or listener to understand exactly what we mean. A faulty comparison happens when a sentence accidentally compares things that don't logically match — like comparing a person's height to a building instead of to another person's height. Throughout the history of English grammar, scholars have worked to identify these errors and help writers avoid them.

Understanding how grammar rules developed helps us see why faulty comparisons are such a common stumbling block. As English evolved from Old English through Middle English to Modern English, the language became more flexible — but that flexibility also made it easier to accidentally create confusing sentences.

The core question that this lesson addresses is: How do we make sure a comparison in a sentence is logically parallel — that is, that we are comparing like with like? Once you can spot where comparisons go wrong, you can fix them quickly and make your writing much clearer.

Before we can fix faulty comparisons, we need to understand the principles behind correct ones. A comparison in grammar is any sentence structure that measures one thing against another. Think of comparisons as a balance scale: both sides need to hold the same type of thing, or the scale doesn't make sense.

The diagram below shows how a faulty comparison works versus a correct comparison. On the left, you can see a comparison that accidentally matches two unlike things. On the right, the comparison is corrected so both sides of the "than" match logically.

Notice how small the fix was — just one apostrophe and the letter "s." But that tiny change makes the sentence logically correct. The faulty version compares Jake's grades to the whole person of Maria, which doesn't make sense. The corrected version compares Jake's grades to Maria's grades, which is exactly what the writer intended.

Faulty comparisons come in several forms. Understanding the mechanism behind each type helps you spot and fix them quickly. Let's look at the main patterns.

Type 1: Mismatched Categories

This is the most common type. One side of the comparison names a quality, attribute, or possession, while the other side names the whole person or thing. The fix usually involves adding a possessive or the phrase "that of" / "those of" to the second item.

Type 2: Incomplete Comparisons

An incomplete comparison uses a comparative word (like "better," "more," or "less") but never tells us what the item is being compared to. For example: "Our pizza is better." Better than what? Another restaurant's pizza? A homemade version? The reader can't tell. The fix is to complete the comparison: "Our pizza is better than any other pizza in town."

Type 3: Ambiguous Comparisons

An ambiguous comparison can be understood in two different ways. Consider: "I like soccer more than Marcus." Does that mean "I like soccer more than Marcus likes soccer" or "I like soccer more than I like Marcus"? Both readings are grammatically possible. The fix is to add the missing words so the meaning is crystal clear.

Type 4: Comparing Something to Itself

Sometimes a comparison accidentally includes the item being compared within the group it's compared to. For example: "Jupiter is larger than any planet in the solar system." Since Jupiter is a planet in the solar system, this sentence says Jupiter is larger than itself! The fix is to add "other": "Jupiter is larger than any other planet in the solar system."

Now that you know the types of faulty comparisons, let's look at the specific fix strategies you can use. The flowchart below walks you through the decision-making process whenever you write or edit a comparison.

Use this flowchart as a mental checklist whenever you write or revise a comparison. Over time, you'll internalize these checks and catch faulty comparisons before they even make it onto the page.

Let's walk through a complete example, step by step, to see how you can identify and fix a faulty comparison in real writing.

Even experienced writers make faulty comparisons. Below is a table of the most common errors, why they happen, and how to avoid them.

Avoiding faulty comparisons is one piece of a larger set of skills called logical clarity in writing. As you advance in your writing, you'll encounter related concepts that build on the same principle of making sure your sentences say exactly what you mean.

On standardized tests like the SAT, ACT, and AP English exams, faulty comparisons are one of the most frequently tested grammar topics. Mastering this concept now gives you a strong foundation for those tests and, more importantly, for writing clearly in college essays, workplace reports, and everyday communication.

Try these five problems on your own. For each one, identify whether the comparison is faulty, explain why, and write a corrected version. Then check your answer.