Why Evidence Matters in Writing
Have you ever read something and thought, "Wait, how do they know that?" That feeling is your brain noticing a claim without evidence. Writers have struggled with this problem for thousands of years. From ancient speeches to modern news articles, strong writing has always depended on backing up ideas with proof.
On the SHSAT, you will see passages where one sentence makes a big statement but does not support it. Your job is to find that sentence. Let's look at how the idea of using evidence in writing developed over time.
Today, being able to spot a sentence that lacks support is not just a test skill. It helps you become a better reader, writer, and thinker. So what exactly does a sentence "needing evidence" look like? That is the question we will answer in this lesson.
Core Principles: Claims, Evidence, and Gaps
Before you can find a sentence that needs evidence, you need to understand three key ideas. A claim is a statement that says something is true. Evidence is the proof that backs up that claim — like facts, numbers, examples, or expert quotes. An evidence gap is what happens when a claim sits alone without any support.
Claim
Evidence
Evidence Gap
Explanation
Signal Words
Seeing the Evidence Gap
The diagram below shows how a well-supported paragraph works. Each claim connects down to evidence. When a claim has no evidence below it, you can see the gap right away. That gap is exactly what the SHSAT asks you to find.
Notice that Sentence 3 uses the word "significantly." Words like significantly, most, best, and always are strong claim words. They almost always need evidence to back them up. Keep an eye out for these when you read a passage on the SHSAT.
How to Find the Sentence That Needs Evidence
On the SHSAT, questions about evidence usually ask something like: "Which sentence would best be supported by adding a specific detail or example?" Here is a step-by-step method you can use every time.
The 4-Step Evidence Check
Read the Whole Passage
Label Each Sentence
Check the Claims
Pick the Weakest Claim
Let's look at the types of evidence you might expect a writer to include. Knowing what good evidence looks like helps you notice when it is missing.
| Evidence Type | What It Looks Like | Example |
|---|---|---|
| Statistic | A number, percentage, or measurement | "Sales increased by 40% in 2022." |
| Specific Example | A real person, place, or event | "In Portland, Oregon, a new bike lane reduced accidents on Oak Street." |
| Expert Quote | Words from a knowledgeable source | "Dr. Lin, a marine biologist, stated that coral reefs are shrinking." |
| Explanation | A sentence that tells HOW or WHY | "Because sunlight helps plants make food through photosynthesis, gardens need at least six hours of light." |
Trigger Words and Red Flags
Certain words and phrases are like alarm bells. When you see them in a sentence, stop and check: does the passage give proof? We call these trigger words because they trigger the need for evidence. The diagram below groups these trigger words into categories.
Not every sentence with a trigger word is automatically the right answer. Sometimes the evidence appears in the very next sentence. The key is to read the sentences around the claim. If no evidence follows, that sentence needs more support.
Worked Example: Finding the Unsupported Sentence
Let's walk through a passage just like one you might see on test day. Read it carefully, then follow the four steps.
Common Mistakes and How to Avoid Them
Students often lose points on this question type because of a few common traps. The table below shows the most frequent mistakes and how to fix them.
| Common Mistake | Why It's Wrong | What to Do Instead |
|---|---|---|
| Choosing a sentence just because it is short | Short sentences can be evidence (like a statistic). Length does not equal weakness. | Focus on whether the sentence makes a claim, not on its length. |
| Picking a sentence that already has evidence nearby | If the next sentence gives a fact or example, the claim IS supported. | Always read the sentence BEFORE and AFTER a claim before deciding. |
| Confusing a topic sentence with an unsupported claim | A topic sentence introduces an idea. It might be general, but the paragraph may support it. | Check: does the rest of the paragraph give details about the topic sentence? |
| Ignoring vague phrases like "many people" or "research shows" | These phrases SOUND like evidence but do not name specific sources. | Ask: WHO are these people? WHICH research? If no answer, it is an evidence gap. |
Connecting to Advanced Writing Skills
Finding sentences that need evidence is a skill you will use long after the SHSAT. In high school, you will write research papers where every argument must be backed by sources. In college, professors call this evidence-based reasoning. The table below shows how this SHSAT skill connects to what comes next.
| SHSAT Skill (Now) | High School Skill (Next) | College / Career Skill (Later) |
|---|---|---|
| Identify which sentence needs evidence | Add citations and quotes to support your own claims in essays | Evaluate sources for reliability in research and professional work |
| Spot vague claims like "experts agree" | Learn to use MLA and APA citation formats | Distinguish credible studies from misleading data in news and media |
| Recognize trigger words (best, always, significantly) | Write thesis statements that are arguable and provable | Build persuasive arguments in presentations, proposals, and debates |
Mastering this skill now gives you a huge advantage. You will walk into high school English already knowing how to spot weak arguments and strengthen them. That is a skill many students do not develop until much later.
Practice Problems
Lesson Summary
On the SHSAT, you will be asked to find the sentence in a passage that needs more evidence or explanation. Start by reading the whole passage, then label each sentence as a claim or as evidence. Look for trigger words like "best," "always," "significantly," and "most" — these signal strong claims that almost always require proof.
When you find a claim, check the sentences around it. If there is no statistic, specific example, expert quote, or explanation to back it up, you have found the evidence gap. Remember: the bigger the claim, the more evidence it needs. Use the 4-Step Evidence Check on every practice passage until it becomes second nature.