조동사 must

1.반갑게 환영할 때 (격한환영)
You must be Mike. Everyone speaks highly of you.
You must be Carmen. 

2.위로/공감할 때
It must be hard. 힘들겠다.
It must be hard/rough/tough.
Sorry, Teddy. It must be tough for you.
Lisa, this must be a rough time for you.
You must be hungry.
You must be tired.
You must be exhausted. 

3. 실수를 가볍게 인정할 때
I must have [머스땝] missed the memo/email.  
Is that right? I must have missed the memo.
I must have missed that card.
See. I must have made a mistake somewhere.

https://www.youtube.com/watch?v=Ss3L0NygI4s&list=PLR7-VNIJm0KLsPxakC7K_bYtqQGJMheqd&index=9