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Why some English sounds feel impossible
Every language uses a different set of sounds. When you learn English, you encounter sounds that simply don't exist in your native language. Your mouth has never practiced making them, so your brain substitutes the closest sound it knows. This isn't a sign of failure. it's how every human brain works. The fix is identifying which sounds are new for you and training your mouth to make them.
th → s or t
Spanish, French, and Japanese speakers often replace 'th' with 's' or 't'.
r → l
Japanese and Korean speakers sometimes swap 'r' and 'l'.
v → w
German and Hindi speakers may mix up 'v' and 'w'.
Tip
You only need to fix the sounds that cause confusion. Not every substitution matters equally.