After studying English to some extent, you may not be able to communicate with your friend even if you intend to pronounce correctly. "thin" is learned to "pronounce with the tip of the tongue touching the upper front teeth", and even if you intend to do so, your friends may hear "thing". This app output your English recognition result by Google Speech-to-Text service. You can try again, check the meaning, search the web for how to pronounce, etc. You can practice with your computer over and