Sources we use
We build lessons only from public-domain or openly licensed material and from our own writing. Before using a source we check its licence on the original page and record the page, licence and date we retrieved it. Each lesson shows its source and licence. A credit does not mean the original publisher endorses this site.
How a lesson is made
For a listening lesson based on another work we choose five sentences quoted exactly from the source; for our own dictation lessons we write the five sentences ourselves. The audio is cut from the original recording or, when no recording is available, read by an open-source text-to-speech voice. We then write a short explanation for each sentence and a few vocabulary notes. Automated checks confirm that each sentence matches the source text and that the audio says it. Our other lessons are our own writing, except B1 and B2 reading texts, which are unchanged excerpts from VOA Learning English. Listening scripts are read by an open-source text-to-speech voice. Automated checks confirm that every exercise has a valid answer key, that excerpts match the original article and that each recording says its script.
Use of AI tools
AI tools help us draft lessons, practice texts, exercises, explanations and vocabulary notes and run our checks. A separate AI review checks every answer and explanation before a lesson is published. Lessons have not all been reviewed by a teacher yet; if you find a mistake, tell us through the Contact page and we will correct it.
Answer checking
Checking ignores capital letters, commas, extra spaces and final punctuation, and accepts a few common variations such as US and UK spelling or numbers written as words. It is a practice aid, not an exam score.
Corrections
Report a mistake through the Contact page with the lesson address and the sentence or question number. We correct the lesson and release it as a new version, keeping the source credit.