What is the 10,000 sentences method?

The 10,000 sentences method is the idea that if you collect and review around ten thousand real sentences in your target language, reviewing them with spaced repetition, you absorb enough grammar and vocabulary to read and understand without translating in your head. It's sentence mining with a target number attached.

The framing comes from Khatzumoto's All Japanese All The Time blog in the late 2000s, which set the memorable "10,000 sentences" goal and pushed learners to mine real Japanese rather than drill textbook grammar. The habit underneath it, collecting example sentences into a spaced-repetition system, is older still: the Antimoon site argued for it years earlier for English. So the number is Khatzumoto's. The method behind it isn't new.

Don't take ten thousand literally. Nobody counts to exactly that, and the figure isn't a fluency threshold anyone has measured. What actually works is the routine underneath it: mine sentences you genuinely meet, keep them at your level (Krashen's i+1), and review a few every day. Do that and the count looks after itself. It's the same engine as everyday sentence mining, just with a headline goal bolted on.