- confident in what one thinks or knows; having no doubt that one is right确信的; 有把握的：
I'm sure I've seen that dress before
我确信我以前看到过那件衣服
she had to check her diary to be sure of the day of the week.
她不得不查看日记来确定是星期几。
sure of
having a certain prospect or confident anticipation of确定的：the Gunners are sure of a UEFA Cup place.
枪手队稳拿欧洲联盟杯赛前几名。
- with infinitive certain to do something肯定的, 一定的：
it's sure to rain before morning.
黎明之前肯定会下雨。
- true beyond any doubt无可置疑的：
what is sure is that learning is a complex business.
毫无疑问, 学习是个复杂的事情。
- attrib. able to be relied on or trusted可信的：
her neck was red-a sure sign of agitation.
她的脖子红了——无疑是激动的迹象。
- confident; assured确信的; 确定的：
the drawings impress by their sure sense of rhythm.
这些图画以其明确的节奏感引人注目。
- informal certainly (used for emphasis)〈非正式〉肯定, 无疑（用于强调）：
Texas sure was a great place to grow up.
得克萨斯州无疑是孩子们成长的好地方。
- as an exclamation used to show assent表示同意当然：
'Are you serious?' 'Sure.'
“你是认真的吗？”“当然啦。”
be sure
- usu. in imperative do not fail (used to emphasize an invitation or instruction)一定要; 务必（用于强调邀请或指示）：
with infinitive be sure to pop in一定要来
with clause be sure that you know what is required.务必弄清楚要求是什么。
for sure
- informal without doubt〈非正式〉毫无疑问：
I can't say for sure what Giles really wanted.
我说不准贾尔斯真正想要的是什么。
make sure
- usu. with clause establish that something is definitely so; confirm把…弄清楚; 确定：
go and make sure she's all right.
去弄清楚她是不是真的没事。
- ensure that something is done or happens确保：
he made sure that his sons were well educated.
他确保他的儿子们都受到了良好的教育。
(as) sure as eggs is eggs（亦作as sure as fate）
- without any doubt千真万确, 无可置疑。
sure enough
- informal used to introduce a statement that confirms something previously predicted〈非正式〉果真：
when X-rays were taken, sure enough, there was the needle.
拍完X光片后, 果真有一根针。
sure of oneself
- very confident of one's own abilities or views非常自信：
he's very sure of himself.
他非常自信。
sure thing
- informal a certainty〈非正式〉确定无疑的事情。
- as exclamation chiefly N. Amer. certainly; of course〈主北美〉当然：
'Can I watch?' 'Sure thing.'
“我可以看看吗？”“当然。”
to be sure
- used to concede the truth of something that conflicts with another point that one wishes to make固然, 必须承认：
the ski runs are very limited, to be sure, but excellent for beginners.
滑雪道作用很有限, 但必须承认, 对初学者非常适用。
- used for emphasis［用于强调］当真; 哎呀：
what an extraordinary woman she was, to be sure.
她真是个非同一般的女人呀！