You must be ~ 이겠다

You must be worried sick

You must be hungry

You must be pretty nervous about something

You must be joking

You must be pretty upset

You must be out of your mind.

I have walked all the way home

Oh my gosh. You must be so tired. How about I take you out for dinner?

참고 서적 : 영어회화의 결정적 패턴 (www.yes24.com/Product/Goods/74400061?scode=032&OzSrank=1)