Compare and Contrast Sentence Starters for Elementary Students

Teaching students to compare and contrast is one of those skills that shows up everywhere. Students compare characters in stories, animals in science, historical figures in social studies, and even their favorite recess games. The challenge is that many students know what they want to say, but they are not always sure how to begin the sentence.

Compare and contrast sentence starters help students organize their thinking into clear academic language. These short phrases give students a simple way to explain similarities and differences without getting stuck on how to begin. When students have language support, they can focus on the actual thinking instead of worrying about wording.

What Are Compare and Contrast Sentence Starters?

Compare and contrast sentence starters are short phrases that help students begin sentences when explaining similarities and differences between two or more ideas.

They act as scaffolds for academic writing. Instead of students writing short or repetitive sentences like:

“Dogs and cats are different.”

Students can expand their thinking with structured language such as:

“One similarity between dogs and cats is that…”
“A key difference between the two animals is…”

These starters support students when they are writing paragraphs, answering reading questions, or explaining ideas in science and social studies.

If you are looking for ideas students can write about, this collection of Compare and Contrast Topics for Students includes many classroom-friendly comparison ideas.

Compare and Contrast Sentence Starters and Sentence Frames

Below you’ll find compare and contrast sentence starters and compare and contrast sentence frames that work well for grades 2–5. These can be used in writing lessons, reading responses, science journals, and social studies comparisons.

Sentence Starters for Similarities

Students often begin by identifying how two things are alike. These sentence starters help students introduce similarities clearly.

Examples students can use:

• One similarity between ___ and ___ is that ___.
• Both ___ and ___ have ___.
• ___ and ___ are alike because ___.
• A way that ___ and ___ are similar is ___.
• Another similarity is that ___.
• Just like ___, ___ also ___.
• Both examples show ___.

These starters work well when students compare characters, animals, inventions, or scientific ideas.

Sentence Starters for Differences

When students identify differences, they often need more structured language. These sentence starters help students explain how two ideas are not the same.

Examples include:

• One difference between ___ and ___ is ___.
• ___ is different from ___ because ___.
• Unlike ___, ___ ___.
• In contrast, ___ ___.
• While ___ has ___, ___ has ___.
• Another difference is that ___.
• ___ has ___, but ___ has ___.

These starters are useful for reading comprehension responses, science observations, and social studies comparisons.

Sentence Frames Students Can Use

Compare and contrast sentence frames are similar to sentence starters, but they provide more structure. Sentence frames include blanks where students fill in their ideas.

Sentence frames are helpful for students who are still developing academic language or who benefit from additional support.

Examples of compare and contrast sentence frames:

• Both ___ and ___ have ___, but ___ has ___.
• ___ and ___ are similar because ___.
• A key difference between ___ and ___ is ___.
• While ___ can ___, ___ cannot ___.
• ___ is similar to ___ because ___.
• One important way they are different is ___.

Teachers often introduce sentence frames first and then transition students to sentence starters as students gain confidence.

The table below shows examples of compare and contrast sentence starters and compare and contrast sentence frames that students can use when writing about similarities and differences.

Purpose	Sentence Starter	Sentence Frame
Similarities	One similarity between ___ and ___ is…	Both ___ and ___ have ___
Similarities	___ and ___ are alike because…	Both ___ and ___ can ___
Similarities	Another way they are similar is…	___ is similar to ___ because ___
Differences	One difference between ___ and ___ is…	___ has ___, but ___ has ___
Differences	Unlike ___, ___…	While ___ has ___, ___ has ___
Differences	In contrast, ___…	___ is different from ___ because ___
Comparing Details	Both examples show…	Both ___ and ___ show ___
Contrasting Details	A key difference is…	One important difference between ___ and ___ is ___

Compare and Contrast Unit

If you are looking for a structured way to teach this skill, this Compare and Contrast Unit provides lessons and activities that guide students through identifying similarities and differences, organizing ideas, and writing comparison sentences.

The unit includes activities that help students:

• practice identifying similarities and differences
• use sentence frames to explain comparisons
• organize ideas with graphic organizers
• write clear compare and contrast sentences and paragraphs

Teachers often use the lessons during reading instruction, writing workshop, or integrated science and social studies units where students compare characters, animals, events, or ideas.

Using Sentence Starters in Informational Writing

Compare and contrast writing is common in informational texts. Students may compare two animals, two historical events, or two scientific processes.

When students write informational paragraphs, sentence starters help them organize their ideas. They can introduce similarities, explain differences, and connect details across multiple sentences.

Teaching Compare and Contrast with Mentor Texts

Books are one of the easiest ways to introduce comparison thinking. Many nonfiction and fiction texts naturally highlight similarities and differences between characters, animals, or events.

Students can read a short text and then use sentence starters to explain their thinking.

For example:

• Both animals live in cold climates.
• Unlike the penguin, the polar bear lives on land.
• One similarity between the two explorers is that they traveled long distances.

Why Sentence Starters Help Students Compare and Contrast

Students usually begin learning this skill by noticing similarities and differences in pictures or simple topics. As they grow, they compare characters, themes, historical events, and scientific concepts.

Sentence starters support students through each stage of the learning process.

Sentence starters can be added to anchor charts, writing folders, or small reference cards students keep in their desks. Many teachers post them near writing centers so students can quickly reference them during writing time.

When students compare and contrast ideas, they are doing complex thinking. They must identify relationships between ideas and explain those relationships clearly.

Sentence starters reduce the language barrier that often slows students down.

With structured language support, students can:

• organize their thinking
• explain similarities and differences clearly
• expand short answers into full sentences
• develop stronger informational writing

Over time, students begin using this language naturally in their writing and discussions.

Describing Is a Key Skill Before Comparing and Contrasting

Before students can compare and contrast ideas, they need to be able to describe them. Describing helps students notice details, traits, and characteristics. Without those details, it becomes difficult for students to explain similarities and differences.

For example, if students are comparing two animals, they first need to describe each animal’s features such as where it lives, what it eats, or how it moves. Once those details are clear, students can begin writing comparison sentences like “Both animals live in cold climates” or “Unlike penguins, polar bears live on land.”

Building strong describing skills helps students write clearer and more specific compare and contrast sentences.

Building Strong Comparison Skills in Student Writing

Compare and contrast sentence starters give students a practical tool for explaining similarities and differences across subjects. With simple language supports, students can move from short answers to thoughtful explanations.

Using compare and contrast sentence frames during instruction helps students learn the language of comparison while building writing confidence. As students practice these structures in reading responses, science journals, and informational writing, the skill becomes part of how they naturally explain their thinking.