Discussion ----- Future work to do

• The phonetic characteristic of (s`_v) and (i`).

• What are the citation tones of the modal or exclamation syllables? The real tones in a sentence are often “lost” and “ substituted” by the intonations.

• Which is the most important factors for the sound variability? speed? coarticulation? Speaking style? Accent ?

• Stress and the finals

• Lableling of the “Zero_initials”

• Conclusion: Further layers must be annotated in order to solve the problems or study the sound variability.