Error analysis
The tense errors learners make most
A breakdown of the most common grammar errors at B1–B2, with the fixes that stick. Based on n = 412 scripts.
Research
We don't guess how adults learn English — we measure it. Our curriculum is shaped by anonymised data from our own classrooms, published openly so you can see the reasoning.
What our classroom data shows
Across 412 marked B1–B2 writing tasks from our 2025 cohort, nearly half of all tense errors involved the present perfect — a pattern driven by how learners' first languages map onto English. We turn findings like this into targeted lessons.
Method
Feedback timing beats volume
Why five corrected sentences a day outperform fifty exercises once a week. (Note in progress)
Method
Vocabulary in chunks, not lists
Retention data on learning collocations vs. isolated words. (Note in progress)
Our standard of evidence
Every figure we publish states its sample size and method. This is practitioner research from our own anonymised data — useful and honest, but not a substitute for peer-reviewed study. We say so plainly. See our editorial policy.
Frequently asked questions
Is your research peer-reviewed?
Our published notes are practitioner research drawn from our own anonymised classroom data, not peer-reviewed journal studies. We state the sample size and method for each finding so you can judge it yourself.
Can I use your findings?
Yes, with attribution to Oxford English Global and a link back to the source page. For dataset access or collaboration, contact us.