Vietnamese is a tonal language in which changes of the pitch level and/or contour signal a change in meaning. The Hanoi dialect of Vietnamese has six tones: midlevel, low-falling, high-rising, low-falling-rising, high-rising broken and low-falling broken. Except for the mid-level tone, all the other tones are denoted by diacritics.
These tones are classified into two groups: even and slant tone.
Even tone includes không dấu and dấu huyền; slant tone sắc, hỏi, ngã and nặng.
Orthographically, all twelve vowel letters can receive the tonal marks.
All vowels except for the two bound vowels ă and â can stand alone
and form a word. The two bound vowels never stand as finals.
Hope you have a useful lesson
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