The shape of your mouth and tongue position isn't really about tones. It's more that Mandarin has a bunch of sounds that aren't used in English. It's difficult

The shape of your mouth and tongue position isn't really about tones. It's more that Mandarin has a bunch of sounds that aren't used in English. It's difficult to even hear them at first. For example, x versus sh, j versus zh, or ü versus u.