a. 얼마나/어찌나 D.V. + ㄴ/은지 => "It is so D.V. that . . ." 얼마나/어찌나 D.V. + (었/았)던지 => "It was so/such D.V. that . . ." b. 얼마나/어찌나 (ADV.) A.V. + 는지 => "It is such (ADV.) A.V. that . . ." 얼마나/어찌나 (ADV.) A.V. + (었/았)던지 => "It was such (ADV.) A.V. that . . ."

a.	얼마나/어찌나 D.V. + ㄴ/은지
	=> "It is so D.V. that . . ."
	얼마나/어찌나 D.V. + (었/았)던지
	=> "It was so/such D.V. that . . ."
	b.	얼마나/어찌나 (ADV.) A.V. + 는지
		=> "It is such (ADV.) A.V. that . . ."
		얼마나/어찌나 (ADV.) A.V. + (었/았)던지
		=> "It was such (ADV.) A.V. that . . ."

This construction is used for emphasis. 얼마나 and 어찌나 are generally interchangeable.

(a)

• 나는 얼마나 급한지 신발도 못 신고 뛰어 나갔어요.
  => I was in such a hurry that I ran out without wearing shoes.
  
• 날씨가 얼마나 추웠던지 죽을 뻔 했어요.
  => It was so cold that I nearly died.

(b)

• 그 학생은 어찌나 열심히 공부하는지 잠도 많이 안 자요.
  => The student works so hard that he doesn't sleep much.
  
• 그 차가 어찌나 빨리 가던지 못 따라갔어요.
  => The car went so fast that I couldn't follow it.