2. You must be joking!
3. Are you serious?
5. My goodness!
6. It's amazing that he survived the aircrush.
It is amazing that he survived the aircrushA: Unbelievable!
A: This morming 250 people died in the aircrush except one. The manswam in the sea for days and was saved.
B: How surprising! He must be very strong.
A: Yeah. but he was exhausted when he was saved. It is amazing thathe survived the aircrush. He's a hero.
B: He's lucky too. What if he had met a shark at that moment?
A:Fortunately，there were no sharks around. What a relief!
1.在“You must be joking!/He must be strong.”中的“must"表示推定，意思是“很可能，一定是”，如“You must have been enjoying yourselves."“你们一定玩得很痛快吧。”