Aversion

Swear words

and other undesirable words

By learning these words, and learning which words they typically mispronounce as such words, students' desire to not say them will guide them towards a) correctly pronouncing the words and b) fixing their overall pronunciation model, by way of them forcing themselves to develop the skill of pronouncing the sounds correctly.

It's honestly a surprise that this even needs to be explained, but here we are.

as	/az/	/as/	ass
sheet	/ʃɪjt/	/ʃɪt/	shit
fact	/fakt/	/fʌkt/	fucked
beach	/bɪjʧ/	/bɪʧ/	bitch
piece, peace	/pɪjs/	/pɪs/	piss
can't	/kcɑːnt/	/kʌnt/	c*nt
I want avocado	/ɑj wɔnt a.vəˈkɑː.dəw/	/ɑj wɔn tə ˈfʌ kə dɔɣ/	yes I've really heard this IRL
his	/hɪz/	/hɪs/	hiss
hall	/hoːɫ/	/hoːɹ/	whore
horse	/hoːɹs/	/hoːɹz/	whores
knees	/nɪjz/	/nɪjs/	niece
pitch	/pɪʧ/	/pɪjʧ/	peach

Tonal examples in Vietnamese

enough	đủ	đụ	fuck
pepper	tiêu	tiểu	piss
big; pork	lớn; lợn	lồn	...
part	phần	phân	shit
expect	mong	mông	ass
brush	bàn chải	bạn trai	boyfriend
secret	bí mật	bị mất	lost

Needless to say, mis-intonating these words is problematic in normal conversation, especially if you are speaking your non-native language, as you will likely have several other problems, such as personal accent, mispronunciations, lack of phonemes, grammatical mistakes, missing words, and more!

Language is a large skill, encompassing a multitude of smaller skills which all work together in concert.