* When a trainee is taught this snuffing method for the first time, it is hard to master it, and he may have difficulty vocalizing a sound for a while. Do not let him unconsciously close his lips and take in the air in the mouth.
* Strictly abide by the rule of "one word in one breath". Do not force him to repeat the vocalization when he cannot make a sound.
* Remember that this correction would require perseverance and effort.
The people who are categorized in this group are making the incorrect speech without noticing it. However, since they have a strong will to speak, once the fault is corrected with appropriate guidance, a quick progress can be expected.
