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Pengertian Expressing Of Certainty & Uncertainty

Certainty and uncertainty

Certainty is the state of being completely confident or having no doubt about something. However, uncertainty is when nothing is ever decided or sure.
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.
Expressing uncertainty

When you are not sure whether something or someone will or will not happen, use the following expressions.
For example, to the question:
"Will John follow a career in business?"
you may respond as follows:

Well,
it's possible,
it's impossible,
it might be,
it might not be,
it could happen,
I suppose,

but
I wouldn't like to say for certain.
I'm not sure
I doubt it.
I have my own doubts.
it's doubtful.
It's highly / very unlikely.
you never know of course,
no one can know for certain.
I can't tell you for sure.

Contoh Dialogue Expressing Of Certainty & Uncertainty

Dialogue 1
Peter : Are you sure air pollution is more dangerous for the children?
Jim : Yes, I'm quite sure. It causes the illness for them.

Dialogue 2
Anne : Are you sure all the garbage is easy to destroy?
Marry : No, I doubt about it. The garbage like plastics is difficult to destroy

Dialogue 3
Tamrin : 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.

Dialogue 4
Mini : 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.

Dialogue 5
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.

Read more: http://kumpulan-tugas-sekolahku.blogspot.com/2012/07/expressing-certainty-and-uncertainty.html#ixzz2MuIxg31o

Refferensi
http://www.myenglishpages.com/site_php_files/communication-lesson-certainty-uncertainty.php
http://englishforjunio.blogspot.com/2010/08/expressing-certainty-uncertainty.html
http://ikrapuncak.blogspot.com/2011/05/expressions-of-certainty-and.html