tại sao has 2 syllables: tại: nặng (low, short, glottalized) · sao: ngang (level). You can also listen to it on this page in both Northern and Southern accents.
How common is tại sao in Vietnamese?
tại sao is among the 500 most-used Vietnamese words, CEFR level A1.
How is tại sao used in a sentence?
For example: Tại sao bạn đến muộn? (Why are you late?); Tại sao trời mưa? (Why is it raining?).
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