không biết has 2 syllables: không: ngang (level) · biết: sắc (high rising). You can also listen to it on this page in both Northern and Southern accents.
How common is không biết in Vietnamese?
không biết is among the 500 most-used Vietnamese words, CEFR level C1.
How is không biết used in a sentence?
For example: Tôi không biết anh ấy là ai. (I don't know who he is.); Cô ấy không biết nói tiếng Trung. (She can't speak Chinese.).
Want "không biết" to stick? Learn it with pictures, audio and spelling practice.