She Learned the Rule. Three Minutes Later, She Broke It Twice.
A student learned the do/make rule, confirmed she understood it, and broke it twice three minutes later. That gap is why DET scores stall, and why studying harder does not close it.
Last week a student of ours was talking about her cousin during a speaking task. She said, "Why is she making this?"
We stopped her and asked whether her cousin got anything physical out of it. No, she said, so it should be doing.
She was right, and she knew it instantly. We'd taught her the rule about ten minutes earlier. You make things you can hold: money, a sandwich. You do things that leave nothing behind: homework, work, the dishes.
Then she went back to talking about her cousin and said "she already made three majors," and a few sentences later, "she already made her PhD."
Three minutes. Same mistake, twice, right after she'd explained the rule back to us correctly.
Why she couldn't use what she knew
If you're studying for the Duolingo English Test and your score won't move, this is worth understanding, because it's probably happening to you too.
Her first language is Portuguese. In Portuguese, fazer covers both English verbs. Spanish does the same with hacer, French with faire. English asks her to make a choice her own language never asks her to make, and she has to make it every time the verb comes up.
Reading a grammar explanation, she makes that choice correctly every time. Speaking, with a timer running and a topic she didn't pick and a story she's assembling as she goes, she reaches for the verb she's used since she was a child.
She still knows the rule. She just can't get to it fast enough.
Researchers who study this call it skill acquisition theory. The short version is that you first learn a rule, then you learn to apply it, and eventually you apply it without thinking about it at all. Moving from the first stage to the last takes practice under real conditions. Reading the rule again more carefully doesn't do it.
If explanations were enough, she would have been fine. She had the explanation. She'd repeated it back to us correctly three minutes before she broke it.
This is not a Portuguese problem. Every first language leaves its own fingerprints, and we've written about the specific ones we see most: Arabic speakers, Italian speakers, and Spanish speakers.
What the test does about it
The DET notices. It just doesn't tell you.
Grammatical accuracy feeds your Production score, so an error like this costs you points across the speaking and writing tasks. What comes back is a number. Not "you're confusing do and make." Just 105.
So you study harder, take it again, and get 105 again. You spent that month studying things you already knew. If that describes your last few attempts, our breakdown of why Production scores stop moving goes deeper into it.
Most practice tools have the same limit. They score your answer after you've submitted it. Nobody stops you in the middle of the sentence.
That's what worked in her lesson. Not the explanation, she'd already had that. Somebody stopped her while the sentence was still in her mouth and made her fix it herself.
Two kinds of problem
Some problems really are solved by information. If you don't know what the score bands actually mean, reading that solves it. If you don't know you can't look away from your screen during the test, reading the setup rules solves it, and it may save your result from being thrown out.
The difference matters, because the two need completely different work.
| Fact problem | Habit problem | |
|---|---|---|
| Can you explain the rule? | No | Yes |
| What it feels like | You didn't know | You knew, and did it anyway |
| Example | Not knowing a second camera is required | Confusing do and make while speaking |
| Does more studying help? | Yes | No |
| What fixes it | Reading the right thing once | Being caught in the act, repeatedly |
| How long it takes | Minutes | Weeks |
Most people who are stuck have already cleared out everything in the left column. That's usually why they're stuck.
Worth checking it anyway before your next attempt, since the rules around setup and ID are the most common reason results get invalidated, and that has nothing to do with your English at all.
What to do instead
If your score has stopped moving, stop asking what you don't know. Ask what you know and still don't do.
For most students that list is short. Three or four grammar habits, maybe a couple of structural ones. Nothing exotic.
Finding your own list is hard, because the same effort that produces the mistake is what stops you hearing it. You'd have to listen closely to yourself while also speaking, and nobody can do both at once.
Want someone to find your list?
Our $25 DET diagnostic is a one-hour session where we listen to you produce English under pressure and tell you which patterns are costing you points. Nothing to commit to beyond the hour.
If you're weighing up whether to keep self-studying or work with someone, our DET course page explains how the lessons are structured, and what the test itself costs once retakes are counted in.
Not sure why your DET score is stuck?
Take a free practice test and see exactly where your score leaks — before you pay for the real thing.
Start the free practice test →Frequently asked
Why is my Duolingo English Test score not improving?
If your score repeats across attempts, the cause is usually a small set of automatic habits rather than missing knowledge. Studying more of what you already know does not change habits that only appear when you are speaking at full speed.
What is the difference between do and make in English?
Use make when the action produces something physical, such as make money or make a sandwich. Use do when nothing physical results, such as do homework or do work. Speakers of Portuguese, Spanish and French often confuse the two because their first language uses one verb for both.
Does the Duolingo English Test tell you what you got wrong?
No. The DET reports an overall score and subscores. It does not identify the specific errors that lowered your Production score, which is why repeated attempts often return the same result.
Can practice tests fix a stuck DET score?
Practice helps when the problem is unfamiliarity with the format. It helps far less when the problem is a habit, because most tools score your answer after you submit it rather than catching the error as you produce it.
How long does it take to fix a grammar habit?
Knowing a rule takes minutes. Making it automatic under time pressure usually takes weeks of practice in which the error is caught as it happens, not reviewed afterwards.
Keep reading
What to Do When You Don't Know the Word in DET Speaking
A student who couldn't name the place he was standing in learned to describe a deep-sea animal he'd never seen. The same chain keeps you talking when a word disappears in the test.
Why You Run Out of Things to Say on the DET Speaking Test
You have the English, but on DET Speaking you go quiet a sentence or two in. The real problem isn't vocabulary — it's generating ideas under pressure. Here's what to train.
DET for Italian Speakers: 3 Habits Costing You Points
Italian speakers lose DET points to three habits: false friends, Italian information order, and all-certainty answers. A real student case: 90 to a certified 105.