1.DialogueA : 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

Dialogue 2Anne : Are you sure all the garbage is easy to destroy?Marry : No, I doubt about it. The garbage like plastics is difficult to destroy
3Tamrin : Hey, don’t you know that we have a school bus now?Firman : Are you certain?Tamrin : Yes, of course. The headmaster himself told me.
4Mini : I heard, our classroom will be renovated in the next view days.Nur : Are you sure?Mini : Well, I can’t tell you for sure. I think we should ask our teacher.
 5Jalal : What do you think we should give Arni as her birthday present?Rusli : A doll, I thinkJalal : Are you sure?Rusli : Yes, certainly. As far as I know, she likes doll.Jalal : Well, it is possible I suppose, but I doubt it.Rusli : So, what do you think?Jalal : Why don’t we buy her a wristwatch?Rusli : I don’t think so. It’s too expensive.Jalal : You are right, but we can collect the money.Rusli : Still, I doubt it. I’m broke now. I don’t think I can get enough moneywithin this week.Jalal : Well, doubt isn’t going to do anything. I can lend you the money if you want.Rusli : Really?Jalal : Certainly.Rusli : Thank you very much.Jalal : Don’t mention it.