You spend a full week teaching commas in a compound sentence. You explain it, model it, give practice, check for understanding, and your students get it. Then three or four weeks later, you’re reading their writing, and there isn’t a comma in sight. It’s like the lesson never happened.
If grammar skills are disappearing from your upper elementary students’ writing, it’s not a reflection of how well you taught the lesson. It’s information. It’s telling you something real about what’s missing in the sequence underneath that skill, and once you can name the gap, you know exactly where to go next.
Here are the three most common reasons grammar skills disappear in upper elementary, and how to find which one is causing yours.
Reason #1: The Skill Was Taught Without Its Foundation in Place
Every grammar skill depends on something else. It never stands on its own. When students don’t have what’s holding a new skill up, there’s nothing for that new information to attach to, so it floats for a moment, and then it floats away.
Take commas before coordinating conjunctions, a common upper elementary skill. To actually understand why that comma goes there, a student needs to already know:
- Nouns and/or pronouns
- Verbs
- Subjects and predicates (built from the two above)
- The structure of a complete sentence vs. a fragment
- Compound sentences (joining two complete thoughts)
- Coordinating conjunctions and how each one functions
That’s six prerequisite pieces underneath one “simple” comma rule. If even one of those blocks is missing, the whole stack wobbles. Students might memorize the rule well enough to pass Friday’s quiz, but it has nowhere to live in the long term because the foundation it’s supposed to sit on isn’t fully in place.
What to do about it: Before teaching any new skill, pause and ask: What does this depend on? What do they need to already understand for this to make sense? Jot down two or three prerequisite pieces, then run a quick check, like a morning warm-up or a three-question slip of paper at the door, to confirm that foundation is actually solid before you build on it. What Is the BUILD Framework?
Reason #2: You Teach It Once and Move On
This one isn’t a confession exclusive to any one teacher. It’s nearly universal. We teach a skill well for about a week, then move on and never circle back.
One week of practice is exposure, not retention. The brain needs to encounter a skill again and again, in different contexts, before it sticks in the long term. Think about learning to ride a bike: you can’t watch someone do it once and master it yourself. If you’re off the bike for a few weeks, you’re wobbly when you get back on. Grammar works the same way. If the only time students see commas in a compound sentence is that one unit in October, of course it fades by December.
What to do about it: Plan to bring the skill back at least two or three times after the initial lesson. This doesn’t mean reteaching the whole lesson. It can be small:
- A quick warm-up where students fix a sentence
- A mentor sentence pulled from a book you’re already reading together
- An editing checklist during writing time that specifically flags compound sentences
Any small moment where the skill resurfaces in a new context counts as the practice their brains need. It doesn’t have to be a production. It just has to happen more than once.
Reason #3: Students Learned the Rule, Not the Why
This is the sneakiest of the three because, on the surface, it looks like total mastery. They circle the right answer. They fill in the blank correctly. They do well on the quiz.
Ask them why the answer is correct, though, and a lot of them can’t tell you. They’ve memorized the pattern without understanding the reasoning, and the moment the context shifts even slightly from what they practiced, they have nothing to fall back on. They can only recognize what they’ve already seen; they can’t reason through something new.
What to do about it: Spend time on the why before you ever introduce the rule itself. Instead of “put a comma here,” ask “why does this comma go here?” The answer- because there are two complete thoughts and we need to signal to the reader that we’re connecting them, is what lets a student reason through a sentence they’ve never seen before, instead of just pattern-matching to one they have.
Join The BUILD Framework
Join The BUILD Framework, and if you want to keep reading about grammar planning and instruction in the meantime, these posts are a natural next step:
Related Episodes:
- Grammar Skills: How To Use Skill Stacking To Spot Gaps And Strengthen Foundations
- Spiraling Grammar: 2 Effective Review Strategies For Making Grammar Stick
So What Do You Do With This?
Pick one grammar skill your students consistently struggle with. Just one. Then ask which of these three reasons fits best:
- Is the foundation underneath it actually missing?
- Did you only teach it once and never circle back?
- Do they know the rule, but not the why behind it?
Whatever the answer is, that’s exactly where to start, not by reteaching the whole skill louder or harder, but by closing the actual gap underneath it.
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