nếu không means "otherwise" (conjunction). otherwise.
How is nếu không pronounced?
You can listen to nếu không on this page in both Northern and Southern Vietnamese accents.
How is nếu không used in a sentence?
For example: Nhanh lên, nếu không sẽ muộn. (Hurry up, otherwise you'll be late.); Bạn phải học, nếu không sẽ trượt. (You have to study, otherwise you'll fail.).
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