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‘어찌나 –은지/ㄴ지/는지’ is used to emphasize the action or situation in the beginning of the sentence and show that the consequence results from it. The consequence is often exaggerated.
● 어찌나 밥을 많이 먹었는지 배가 터질 것 같아요.
● 한국어를 어찌나 잘하는지 다들 한국 사람인 줄 알아요.