nếu không thì means "otherwise" (conjunction). otherwise.
How is nếu không thì pronounced?
You can listen to nếu không thì on this page in both Northern and Southern Vietnamese accents.
How is nếu không thì used in a sentence?
For example: Nhanh lên, nếu không thì trễ. (Hurry up, otherwise you'll be late.); Làm đi, nếu không thì bị phạt. (Do it, otherwise you'll be punished.).
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