... consonants. So sequences and clusters of consonants in English will cause difficulties. + /s/ plus initial p, t , k in ‘splay, string, screen’. + Final consonant clusters with / s/ are sometimes ... changes in the pronunciations of the vowels, and sometimes also of the consonants. In other cases, the stress doesn’t move, but the vowels and consonants change anyway. In most cases, an unstressed ... contrasted with two sounds / t / and / th/ in Vietnamese, it is between these two sounds. For / / as in ‘rouge’. Learners tend to use the sound /r / as in ‘rare’ to substitute for this so we can help...