confident that you know sth or that you are right
‘Is that John over there?’ ‘ I'm not sure .’
You don't sound very sure.
I'm pretty sure (that) he'll agree.
Are you sure you don't mind?
I hope you are sure of your facts.
Are you sure about that?
Ask me if you're not sure how to do it.
I'm not sure whether I should tell you this.
certain that you will receive sth or that sth will happen
You're always sure of a warm welcome there.
England must win this game to be sure of qualifying for the World Cup.
certain to do sth or to happen
The exhibition is sure to be popular.
It's sure to rain.
that can be trusted or relied on
It's a sure sign of economic recovery.
There's only one sure way to do it.
He is a sure bet for the presidential nominations (= certain to succeed) .
steady and confident
We admired her sure touch at the keyboard.
used to tell sb to do sth
Be sure to give your family my regards.
No one knows for sure what happened.
I think he'll be back on Monday, but I can't say for sure.
One thing is for sure ─it's not going to be easy.
‘Will you be there?’ ‘For sure.’
to do sth in order to be certain that sth else happens
Make sure (that) no one finds out about this.
They scored another goal and made sure of victory.
Our staff will do their best to make sure you enjoy your visit.
to check that sth is true or has been done
She looked around to make sure that she was alone.
I think the door's locked, but I'll just go and make sure.
She seems very sure of herself.
used to say ‘yes’ to a suggestion or request
‘Are you coming?’ ‘Sure thing.’
used to admit that sth is true
He is intelligent, to be sure, but he's also very lazy.
used to say ‘yes’ to sb
‘Will you open the wine?’ ‘Sure, where is it?’
Did it hurt? Sure it hurt.
used to emphasize sth that you are saying
Boy, it sure is hot.
‘Amazing view.’ ‘Sure is.’
That song sure as hell sounds familiar.
He sure looked unhappy.
used to reply to sb who has just thanked you for sth
‘Thanks for the ride.’ ‘Sure─anytime.’
used to say that sth is definitely true
used to say that sth happened as expected
I said he'd forget, and sure enough he did.
These are all words describing sth that will definitely happen or is definitely true.
that you can rely on to happen or be true
They are certain to agree.
[not before noun] certain to happen, or to do or be sth
bound只用于bound to do/be等短语中：
Bound is only used in the phrase bound to do/be , etc.
There are bound to be changes when the new system is introduced.
You've done so much work─you're bound to pass the exam.
certain to happen or be true; that can be trusted or relied on
She's sure to be picked for the team.
It's sure to rain.
( rather informal ) certain to happen; that is not going to change
Is it definite that he's leaving?
( formal ) certain to happen
Victory seemed assured.
They were assured of victory.
These words all describe sb who knows without doubt that sth is true or will happen.
[not before noun] without any doubt that you are right, that sth is true, that you will get sth or that sth will happen
‘Is that John over there?’ ‘I'm not sure.’
Are you sure about that?
England must win this game to be sure of qualifying.
Sure is often used in negative statements and questions, because there is some doubt or anxiety over the matter. If there is no doubt, people often say quite sure .
I'm quite sure (that) I left my bag here (= I have no doubt about it) .
completely sure that sth will happen in the way that you want or expect
I'm quite confident that you'll get the job.
The team feels confident of winning.
Confident is a stronger and more definite word than sure and is more often used in positive statements, when you feel no anxiety.
[not before noun] completely sure that sth is true or right, especially because the evidence seems to prove it or sb else has persuaded you to believe it
I'm convinced that she's innocent.
[not usually before noun] sure that you are right or that sth is true
Are you absolutely certain about this?
sure or certain?
Like sure , certain is often used in negative statements and questions. It is slightly more formal than sure ; sure is more frequent, especially in spoken English.
[not before noun] ( rather informal ) completely sure that sth is true
She was positive that he'd been there.
‘Are you sure?’ ‘Positive.’