Asking for certanty :
A : do you think indonesia's team will win in the competition?
B : yes sure i have no doubt about it
A : but i'm doubtful because China's team is good .. right?
B : hmm i dont think so but its ok if you wanna choice china's team
a: did you call me last night?
b:yes i did
A: really?,i'm sorry .i fell asleep
b: it's ok. i just wan to borrow your novel.did you have any?
a:no i dont
b: are you sure?
A: yes i'm sure