Teach Students to Expand Sentences in Informational Writing

Expanding sentences is one of those skills that every writing teacher knows is important. We want our students to elaborate, add detail, and move beyond short, simple statements. The problem is, almost all of the practice and activities out there are built for narrative writing. And I get why. With narrative writing, students can make up details, add dialogue, throw in a new character, or stretch a scene. There’s so much freedom, so it’s a lot easier for them to expand.

But what about informational writing? It’s just as important (and honestly, often more challenging) for students to be able to write expanded, detailed sentences when they’re sharing facts, explaining a process, or describing a topic.

The good news is, we can teach students to expand informational sentences, too. This blog post will share tips and strategies for teaching students to expand sentences in informational writing.

How to Teach Students to Expand Sentences in Informational Writing

1. Teach Specific Ways to Expand Informational Sentences

Don’t just tell students to “add more details.” Show them exactly what it means to elaborate in informational writing. Here are a few ways:

Add a Definition:
Example: A predator, an animal that hunts other animals, must be quick and strong.
Give Examples:
Example: Some root vegetables, such as carrots and potatoes, grow underground.
Explain a Reason or Cause:
Example: Whales come to the surface because they need to breathe air.
Show the Result or Effect:
Example: The wind picked up, so the kite flew higher.
Add a Follow-Up Detail:
Example: Tornadoes spin quickly across the land and can destroy buildings in their path.
Describe a Process:
Example: Seeds grow into plants by sprouting roots, developing stems, and growing leaves.

When you explicitly model each method, students can see what “expanding” actually looks like in informational writing. (If you want a simple reference for your classroom, I’ll have free posters for each strategy at the end of this post.)

2. Make Sure Expansion Is Embedded in Real Content

Here’s where a lot of sentence expansion practice falls flat: if students don’t know the facts or have background knowledge about a topic, they will struggle to expand an informational sentence in a meaningful way. Unlike narrative writing, they can’t just invent details. They need real information to draw from.

So, what do we do about it?

Teach the Content First:
If you want students to expand sentences about gravity, landforms, or the water cycle, make sure you’ve built up their knowledge about those topics first. This can be through science, social studies, read-alouds, or even quick research.
Embed Sentence Expansion into Content Lessons:
After you finish a science or social studies lesson, give students a simple base sentence about what they just learned, and ask them to expand it using real facts from the lesson.
Or Use Expansion Tasks That Build in the Facts:
Another option is to use sentence expansion tasks that provide the background knowledge right there on the page, like a Q&A menu with facts, definitions, or examples for students to choose from.

If you want these kinds of “all the facts are built in” activities, I’ll have a set of informational sentence expansion warm-ups available.

3. Spiral and Revisit the Skill All Year
Expanding informational sentences isn’t a one-and-done mini-lesson. Students need to practice throughout the year.

The best way to do this is to embed it into your science and social studies whenever possible. After studying any topic, like weather, animals, or important people, have students take a simple base sentence and use their new knowledge to expand it in different ways. Make it a habit to include content writing and ask for elaboration.

During your informational writing unit, regularly revisit this skill. Prompt students to go back and revise their sentences, specifically looking for places where they can elaborate on details. The more often students practice expanding and revising informational sentences, the more natural and effective their writing will become.

FREE Expanding Sentences in Informational Writing Posters

Expanding informational sentences can be tricky for students, but with the right models, a focus on real content, and regular practice, it’s absolutely doable. If you want those free posters for each expansion strategy, just grab them here.