You know the 2000 most common words, and you can follow a lot of what's happening in native content when you have tools to help. Now it's time to deepen that comprehension and start learning vocabulary more efficiently.
Up to this point, you've been learning words from a frequency list — the most common words regardless of topic. But beyond 2000 words, the "next most common" words depend heavily on what you're reading or watching. A medical drama has different vocabulary than a cooking show, which has different vocabulary than a fantasy novel. The words you need to learn next should come from the content you actually enjoy. Domains
This is where sentence mining comes in. Instead of studying a generic word list, you'll be pulling words directly from your immersion and studying them in context. This is one of the most powerful techniques in the Refold method, and for many learners, it becomes their favorite activity.
Sentence Mining — The core new technique. While immersing in a TV show or video with target-language subtitles, you pause when you encounter a sentence with one or two unknown words. You look up the words, make sure you understand the sentence, and save it as a flashcard for later review. Over time, this builds a personalized vocabulary deck drawn entirely from content you care about. Sentence Mining
The workflow takes some time to set up — there are tools involved and it can feel clunky at first. But once you've got the hang of it, the process becomes smooth and almost addictive. The key insight is that you're not trying to mine every unknown word. You're looking for "low-hanging fruit" — sentences where you already understand most of the words and only need to learn one or two new ones.
Domain focus — Rather than trying to understand everything in the language, narrow your immersion to a few related domains (types of content). If you love cooking shows, watch cooking shows. If you like slice-of-life dramas, lean into those. By focusing on a domain, you'll encounter the same vocabulary repeatedly, which means you'll learn it faster and reach comfortable comprehension sooner. Once you've mastered one domain, branching into others is much easier because a lot of vocabulary overlaps. Domains
Pure reading (optional) — If you enjoy reading, this is a decent time to start. Graded readers (stories written for learners at specific levels) work great, but many learners find them boring. Book series aimed at younger readers are often a better choice — they're written for native speakers, so the language is natural, but the vocabulary and sentence structure are simpler than adult novels. Reading a series by the same author also helps because you get used to their style and learn the recurring vocabulary. If you're struggling to read without audio, listening along to an audiobook or narration is a fantastic alternative. Narrow Reading
Your time shifts slightly as sentence mining combines priming and interactive immersion: The Pillars of Language Learning
Sentence mining is inherently interactive (you're pausing, looking things up, saving words), but the flashcard review it produces counts as priming. This tight integration is what makes it so effective.
Move to 2C when you:
Sentence mining aligns with research on incidental vocabulary acquisition. Webb (2020) extensively documented that learners acquire vocabulary incidentally through exposure to meaningful input — exactly what happens when you mine sentences from content you're watching. Learning words in their actual context within engaging content increases retention compared to disconnected word lists.
The emphasis on domain focus draws from research on narrow reading. Krashen (2004) argued that reading extensively within a limited domain — same author, same genre, same topic area — accelerates vocabulary acquisition because learners encounter the same vocabulary repeatedly in natural contexts. Meta-analytic research supports the broader approach: Nakanishi (2015) synthesized 34 empirical studies and found that extensive reading produces consistent positive effects on reading proficiency, with learners who engage with themed, self-selected content showing stronger gains and higher motivation.