About Rainian English
Most grammar resources are written like textbooks: long, padded, and built for classrooms. When you're stuck mid-email wondering whether it's anyone or someone, you don't want a chapter. You want the answer, a reason, and an example — in that order.
Developer-docs for English
Good technical documentation has a recognisable shape. You land, scan, and leave with what you needed. Every guide here follows the same contract:
- Core Mental Model — the one idea that explains most cases.
- Quick Comparison Matrix — a table you can scan in ten seconds.
- Real-World UK Contrasts — near-identical sentences where one word changes the subtext.
- Common Traps — the mistakes that come from translating your first language.
- Micro-Check — three questions to confirm it stuck.
Three minutes. No life stories, no pop-ups, no account.
Why UK English?
Because the UK is where many learners live, work and interview — and because British usage really is different in places that matter:at the weekend, have you eaten yet?, could you possibly…. The guides flag American variants when they're common, so you can recognise both and choose deliberately.
Who it's for
Upper-intermediate learners (CEFR B1–B2+) who already communicate well, but want to sound natural rather than merely correct — especially in workplace and tech settings.
Your data
There are no accounts and no tracking. Your progress ("learned" guides) and theme preference are stored in your browser'slocalStorage and never leave your device.