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词义辨析

be sure of, be sure to

这两个短语意思不同,前者表示自己的主观看法,是针对自己而言的,而后者是表示对他人〔物〕的估计,对别人〔别物〕而言的。例如:
Fight no battle I am not sure of winning.
不打无把握之仗。
They are sure to succeed.
他们一定能成功。

I am sure,I am certain

I am certain比I am sure语气强,前者指“不容置疑的”“确实已成为事实的”,后者指很强的“愿望”“深信”，但是I am not certain与I am not sure意思相同。例如:
I am certain that he has left—I saw him go out.
我肯定他已走了——我看见他出去了。
I am sure that they'll win the game this time.
我肯定这次比赛他们一定赢。
我不能确定她是否过得幸福。
I am not certain if she is happy.
I am not sure if she is happy.

sure, certain, positive

这三个词都表示“肯定的”“确信的”,但所表示的程度有所不同。
1.certain强调有充分的根据,或自己直接所知道的事情的真相。
2.sure强调主观上怀有强烈的愿望或心里没有疑虑。例如:
I'm sure we'll start on time.我想我们能及时出发。
3.positive比sure和certain更加肯定,强调对自己所说的话或所下的结论的正确性深信不疑,常常表现出过分的自信或主观武断。例如:
I am positive that I saw this man before.我肯定我以前见过此人。
As I can't be certain,I won't be positive.在我不肯定时,我不想武断。
4.名词性从句作主语时,一般不用sure,而用certain。

sure，certain，definite，positive

这些形容词都含“无疑的，确信的”之意。
sure侧重主观上对某事确信无疑。
certain与sure同义，但语气比sure强，着重指有确切理由或不容置疑的证据所支持的确信。
definite指已毫无怀疑的余地。
positive语气强烈，指对自己的看法或作的结论的正确性有不可动摇的信念。

双语例句

1、

He wants to make sure that schools are committed to providing alternative education.

他想确保学校尽力提供新型教育。

——柯林斯例句

2、

This proposal is by no means a sure thing.

这个提议绝不会理所当然地获得通过。

柯林斯例句

3、

Be sure you get your daily quota of calcium.

要确保每天的钙摄入量。

柯林斯例句

4、

I'd never seen him like this, so sure of himself, so in command.

我从来没见他如此自信满满、指挥自若。

——柯林斯例句

5、

Even to this day we don't know what happened for sure.

即使到现在我们也不确定究竟发生了什么。

——柯林斯例句

6、

She has a sure grasp of social issues such as literacy, poverty and child care.

她对扫盲、贫穷和儿童保育等社会问题都有深切的认识。

柯林斯例句

7、

I was in a shop when I saw a lady looking carefully at me. She'd recognised me, and sure enough, she came across.

我正在逛商店，突然看到一位女士在仔细地打量我。她认出了我，果不其然，她走了过来。

柯林斯例句

8、

Before you cut the cloth, make sure that the pattern matches up on both edges.

在裁剪布料前要确保两个边缘的图案对称。

柯林斯高阶英语词典

9、

One thing's for sure, Astbury's vocal style hasn't changed much over the years...

有一点可以肯定，阿斯特伯里的演唱风格多年来没怎么改变。

柯林斯高阶英语词典

10、

He'd never been in a class before and he was not even sure that he should have been teaching...

他以前从未教过课，甚至不确定自己该不该教课。

柯林斯高阶英语词典

11、

It sure is hot, he thought.

天的确太热了，他想。

柯林斯高阶英语词典

12、

Sharpe's leg and shoulder began to ache, a sure sign of rain...

夏普的腿和肩膀开始疼痛，这预示着肯定要下雨了。

柯林斯高阶英语词典

13、

Make sure that you follow the instructions carefully...

一定要认真按照操作指南来做。

柯林斯高阶英语词典

14、

We found the English treacle pudding too good to resist. Sure enough, it was delicious...

我们觉得英国糖蜜布丁太好吃了，令人无法抗拒。的确非常美味。

柯林斯高阶英语词典

15、

Anyone who goes food shopping without a list is sure to forget the things they really need.

任何人如果采购食物时没列清单的话，肯定会忘了真正需要的东西。

柯林斯高阶英语词典

16、

With over 80 beaches to choose from, you are sure to find a place to lay your towel...

有 80 多个海滩可供选择，你一定能找到一处满意的。

柯林斯高阶英语词典

17、

Parents make the rules. To be sure, many of the rules are no longer appropriate today.

规矩由父母立下。诚然，其中有许多放在今天已不再合适了。

柯林斯高阶英语词典

18、

A lot of people think that it's better to pay for their education so that they can be sure of getting quality...

许多人认为最好是接受付费教育，这样能确保教学质量。

柯林斯高阶英语词典

19、

'I'd like to be alone, O.K?' — 'Sure. O.K.'...

“我想一个人呆会儿，好吗？”——“好的，没问题。”

柯林斯高阶英语词典

20、

'Has the whole world just gone crazy?' — 'Sure looks that way, doesn't it.'

“整个世界难道都疯了吗？”——“看上去的确如此，不是吗。”

柯林斯高阶英语词典

21、

The president has never been sure which direction he wanted to go in on this issue...

总统一直都不确定自己想从哪个方面来着手处理该问题。

柯林斯高阶英语词典

22、

'He rang you?' — 'Sure. Last night.'...

“他给你打电话了？”——“没错。昨天晚上打的。”

柯林斯高阶英语词典

23、

'Be careful!' — 'Sure thing, Dad. So long.'

“要多加小心!”——“一定会的，爸爸。再见。”

柯林斯高阶英语词典

24、

Be sure to read about how mozzarella is made, on page 65...

务必看看莫泽雷勒干酪是怎么制成的，在第 65 页。

柯林斯高阶英语词典

25、

It is the self-assurance of the new generation which makes them sure of their success.

年轻一代的自信让他们对成功志在必得。

柯林斯高阶英语词典

26、

He looked in the bathroom to make sure that he was alone...

他往浴室里看了看，确定就他一个人。

柯林斯高阶英语词典

27、

You don't sound very sure.

听你这口气，你自己也不大肯定。

牛津词典

28、

Are you sure you don't mind?

你确实不在意？

牛津词典

29、

I'm pretty sure (that) he'll agree.

他会同意的，对此我有相当的把握。

牛津词典

30、

‘Is that John over there? ’ ‘ I'm not sure . ’

“那边那个人是约翰吗？”“我说不准。”

牛津词典

相关短语

as sure as fate千真万确地;
be sure to必定;切;务必;得;
be sure of oneselfv.自信;自信满怀;
be sure of确信;
be sure and一定会，必定会;
be sure about对…有把握;确信;
be sure[法]确信;诚然;有谱儿;
for sure无疑;准保;
know for sure确定地;
make sure that查明;弄确实;弄清楚;保证;
make sure of确定，确保;
make sure确保；设法保证;
pretty sure相当肯定;
sure thing是的，当然;
sure of确信…的;
sure enough果然;的的确确;
to be sure无可否认，诚然;

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