A2 certain; without any doubt确定的,肯定的,毫无疑问的
B1 certain or certainly肯定的(地),确定的(地),无疑的(地)
B2 to be very or too confident非常自信;过于自信
B2 be confident that something is true肯定,确信
UK to have confidence in and trust someone对(某人)有信心,信任
C1 to be certain to肯定,一定
A2 to look and/or take action to be certain that something happens, is true, etc.确保,保证,确定
If you have a sure knowledge or understanding of something, you know or understand it very well.非常清楚的,十分了解的
More examples
If you don't hear from the builders this week, make sure you chase them up.
My wife checks on our elderly neighbour every few days to make sure that he's alright.
I'm not sure of the chronology of events.
A bit of gentle coaxing is all that's required and he'll come, I'm sure.
I'm sure my views on marriage are coloured by my parents' divorce.
A2 certainly当然
US said when someone has thanked you(对别人表示感谢时的回应)没问题
More examples
Sure I'll help you.
'Are you coming to the park?' ' Sure!'
'Do you fancy a pizza?' 'Sure. Let's ask Andy too.'
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