A: hey do you know? we have a new teacher in this school
B: are you sure? and what do you think about the new teacher?
A: I think he is a genius teacher because he come from england.
B: I dont think so. I'm not sure he's a genius teacher . I doubt it
A: hey come on you must join to the champion
B: why must me?
C : because i'm certainly you to be the winner