expressing certainty

Expressing certainty

When you are sure that something will or will not happen in the future, use these expressions.

For example to the question:
"Will John pass the exam?"
you may respond as follows:

Yes,	I'm	absolutely sure quite sure certain positive	he will.
	definitely. certainly. of course.

or

No,	I'm	absolutely sure quite sure certain positive	he won't.
	definitely not. certainly not. of course not.

by : http://www.myenglishpages.com/site_php_files/communication-lesson-certainty-uncertainty.php 

Example :

Jalal : What do you think we should give Arni as her birthday present?

Rusli : A doll, I think
Jalal : 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.


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