Patois is not English pronounced carelessly. The differences are regular, and once you know the rules you can predict most of them. Twelve of the commonest, with the sources they were checked against.
1. TH → T / D: thick→tick, three→tree, thousand→tousan; this→dis, with→wid, the→di, them→dem, brother→bredda. No TH sounds exist in Patois. 2. H unstable (Cockney legacy): dropped ('ave, 'ouse) or ADDED to vowel-initial words (hegg, heat "eat", haks). Initial W can swap for H: ooman/hooman (woman), hood (wood). 3. Final consonant clusters reduce: want→waan, spend→spen, crisp→cris, last→laas, respect→respek, child→chile, stand→tan. 4. Initial S drops in ST/SP/SK: stick→'tick, spit→'pit, skin→'kin, stand→tan, spoil→'pwile. 5. -OWN/-OUND → -UNG: down→dung, town→tung, ground→grung; bounce→bunks. 6. R elides before consonants / finally: burn→bun, turn→tun, work→wuk, horse→haas, hurt→hot; final -er/-or/-ar → -a: water→wata, doctor→docta, better→betta, here→ya, there→deh/dere. 7. "aw" → long "aa": call→caal, bawl→baal, all→aal, war→waar. 8. Short O = short A ("pat"="pot"): man sounds like "mahn" (never nasal American A); hot/hat identical. Don't write "mon" — write man. 9. OI → AI, with W after B/P: boil→bwile, boy→bwai/bwoy, spoil→'pwile, oil→ile, voice→vice, poison→pison. 10. OU/OW softens toward long O in traditional speech: now→noh/now, town→tung, house→hous(e). 11. Palatalization after hard K/G before "a": car→kyar, can't→cyaan, can→kyan, carry→kyai, care→kya; girl→gyal, garden→gyaadn, guard→gyaad. (Not before all A's: "call" = caal, not kyaal.) 12. -TTL-/-TL- → -KL-, -DL- → -GL-: little→likkle, bottle→bokkle; middle→miggle, saddle→saggle, candle→kyanggle. 13. V → B in old words: vex→bex, vittles→bickle, shove→shoob, heavy→hebi, river→riba (deep). 14. Metathesis/intrusion: ask→aks, film→flim, only→ongle; certain, decent→destant. 15. Diphthongized long vowels (deep basilect): name→niem, day→die, know→nuo, stone→stuon. In mesolect these flatten toward name, day, know — acceptable either way; note "ie"/"uo" when quoting deep texts. 16. No weak/schwa vowels; unstressed syllables drop (colloquial aphesis): about→bout, because→caa/kaazn, against→gainst, remember→memba, daughter→dawta. 17. "ear/ere" words: hear→yeri/hear/ya, ears→iez/yez (hard ears = haad iez, stubborn); here→ya/yah, there→deh, where→weh. 18. Intonation (Bailey): yes/no questions are statements with rising intonation — NO inversion, no "do": Yu a come? Tags carry meaning: …noh? (inviting compliance), …yaa (plea "you hear"), …yusi / …iing? (emphatic), …yunuo ("you know"), …nuh true? / seen? (agreement). Pitch can distinguish meaning (Cassidy: it kyaan iit = edible/inedible by tone) — learners must imitate melody, not just words.
Knowing a rule and being able to make the sound are different problems. The sound pages take them one at a time, and the app measures what your mouth is doing.