How to Relearn a Language You've Forgotten

You took four years of French in high school. You haven't used it since. The good news: most of it is still there, just dormant. The relearning protocol can bring back a B1 in 2-3 months.

The bad news: tracking matters more here than for fresh-start learners, because the curve is non-linear.

What's actually happened

Languages don't fully fade. The neural pathways are still there but de-activated. Relearning is faster than first-learning by roughly 2-4× for the recoverable layer.

The recoverable layer is roughly:

• Receptive vocabulary: ~80% recoverable
• Productive vocabulary: ~50% recoverable
• Grammar intuition: ~70% recoverable
• Speaking confidence: ~30% recoverable (the most lost)

The 12-week protocol

Weeks 1-2: gentle reactivation

• 15-30 min daily of comprehensible input (graded reader, slow podcast)
• No grammar drills yet
• Goal: re-tune your ear and eye to the language

Weeks 3-6: vocabulary refresh

• Add 30 min/week of SRS, focused on common-word frequency lists
• One Netflix show in target language with target subs
• Goal: reactivate productive vocabulary

Weeks 7-10: speaking reactivation

• Add weekly tutor (italki) session, 30-45 min
• Daily 5-min self-talk or voice memo
• Goal: rebuild speaking confidence (the slowest curve)

Weeks 11-12: validation

• CEFR self-assessment
• Real-world test (conversation with native speaker, or read a book chapter)
• Goal: confirm what level you've returned to

What to expect from tracking

The hours-to-CEFR ratio is non-linear in relearning. Expect:

• First 30 hours: rapid recovery (the "I remember!" phase)
• Next 30 hours: slower (the actual gaps surface)
• Beyond: roughly normal learning rate

Track expecting front-loaded gains. Many quit at the slowdown thinking they've hit the ceiling. They haven't.

What not to do

• Start with grammar: you've forgotten the feel of the language; rebuild that first
• Compare to your peak: your old peak doesn't matter; track from now
• Skip speaking: it's the most-faded skill; needs the most attention

The realistic outcome

After 12 weeks of moderate effort (~5-7 hours/week), most relearners return to within one CEFR level of their old peak. With sustained effort, they exceed it within 6 months.

For broader strategy on choosing what to do, see how to choose your next language.