Look into mirror (or use https://udk.ai/facemesh/ ) and ... pronounce continuous AAAA , EEEE , IIII and OOOO waves put a finger in front of Your lips; start voicng a vowel sound; while doing so, make Your lips touch Your finger; what do You notice pronounce PA PA PA and BA BA BA pronounce MA MA MA pronounce TA TA TA and DA DA DA pronounce NA NA NA pronounce FA FA FA and VA VA VA ...in all cases, try to answer questions: what is similar ? what is different ?