trước đó has 2 syllables: trước: sắc (high rising) · đó: sắc (high rising). You can also listen to it on this page in both Northern and Southern accents.
How common is trước đó in Vietnamese?
trước đó is among the 2,000 most-used Vietnamese words, CEFR level B1.
How is trước đó used in a sentence?
For example: Trước đó, tôi chưa từng gặp anh ấy. (Previously, I had never seen him.); Chúng tôi đã chuẩn bị kỹ trước đó. (We had prepared in advance.).
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