Retrain Your Ears Before Your Mouth

Research on Japanese adults learning English found that the ear often does something sneaky: instead of noticing a brand-new sound, it quietly matches it to the most similar sound already known in Japanese. This is why certain English sound pairs can feel identical even when they're clearly different to American ears — the pair 'sing' and 'thing' is a great example, since the 'th' sound doesn't exist in Japanese and can get folded into 's.' The fix starts with listening, not speaking. Try this two-minute drill: write down five word pairs like 'sing/thing,' 'mouse/mouth,' and 'sick/thick.' Have a friend, app, or recording say one word from each pair in random order, and guess which one you heard before checking. This kind of active listening practice literally helps your brain carve out a new sound category — which makes producing the sound afterward much, much easier.