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At rest, Vietnamese speakers tend to keep the jaw fairly closed and the lips relaxed and neutral, without much rounding or spreading. The tongue sits slightly forward and high in the mouth.
The Vietnamese comparison is being researched. Daily tips are available.
Vietnamese is syllable-timed: each syllable takes up roughly equal time and keeps its full vowel quality, since tone must be clearly heard everywhere. There's no vowel reduction like English's schwa, so unstressed syllables aren't squashed or shortened. This gives Vietnamese a steady, even beat quite different from the rising-and-falling stress rhythm of English.
At rest, Vietnamese speakers tend to keep the jaw fairly closed and the lips relaxed and neutral, without much rounding or spreading. The tongue sits slightly forward and high in the mouth. What really sets Vietnamese apart is the throat: the larynx works constantly to shape six different tones, each with its own pitch pattern and sometimes a creaky or breathy voice quality. Because tone changes a word's meaning, speakers maintain tight control over pitch on every single syllable, even though the rest of the face stays fairly still. When moving to English, that careful pitch habit can carry over, and syllable-final consonants, which barely exist in Vietnamese, are often dropped or changed.
Standard (Northern/Hanoi) Vietnamese as reference; notes on Southern (Saigon) variety, which typically merges to five tones and has some different final consonant realizations