guarantee/assure/certify/promise/swear.导航词义：保证

1. guarantee:v. 保证，担保.指以口头或书面形式作保证、担保、承诺，含若违背则予以补偿之意。

I can guarantee that he will pay off the debt.

我可以保证他会还清债务的。

I can't guarantee I will finish the work before dark.

我不能保证天黑前完成那项工作。

The law guarantees equal rights for men and women.

法律保证男女平等。

2. assure:v. 向…保证，使确信.指用言语承诺某事一定会发生或一定是真实的，以消除他人的疑虑或担心。

I can assure you that your daughter will be happy here.

我可以向你保证，你女儿在这里会很快乐的。

We assured the tourists of an enjoyable holiday.

我们使游客确信准能过一个愉快的假期。

3. certify:v. 担保.较正式用词，指向他人保证某人或某事物可靠、没有问题等。

certify sb's honesty and reliability

担保某人诚实可靠

I certify on my honour that she is innocent.

我用名誉担保她是清白无辜的。

4. promise:v. 保证，答应.指保证一定会做某事或提供某物，或某事一定会发生，侧重于自己的主观意向，用言语使人感到放心。

He promised to return the money to me.

他保证把钱还给我。

He promised her that he would marry her.

他保证要娶她。

5. swear:v. 起誓保证；;发誓，保证.指以发誓的形式作出保证，或强调自己所说的是真话。

He swore that he would get his revenge.

他发誓要报仇。

I never touched his wallet, I swear!

我绝没有碰过他的钱包，我发誓！

He swore never to gamble again.

他发誓再也不赌博了。

全部

1·She's perfectly safe, I can assure you.

我可以向你保证，她绝对安全。《牛津词典》

2·Victory would assure a place in the finals.

胜利将确保能参加决赛。《牛津词典》

3·Victory would assure them a place in the finals.

胜利将确保他们能参加决赛。《牛津词典》

4·I can assure you that the animals are well cared for.

我可以向你保证这些动物都被照看得很好。《柯林斯英汉双解大词典》

5·Mr. Brownson, I assure you, King's an old enemy of mine.

布朗森先生，我向你保证，金是我的夙敌。《柯林斯英汉双解大词典》

6·You think I did it deliberately, but I assure you (that) I did not.

你认为这是我故意干的，不过我向你保证不是的。《牛津词典》

7·He hastened to assure me that there was nothing traumatic to report.

他急忙向我保证没有任何不快的事要报告。《柯林斯英汉双解大词典》

8·You are mistaken, I assure you!

我向你保证，你弄错了！

9·A real pleasure, I assure you, ma'am!

真正的快乐，我向你保证，夫人！

10·Nothing of the sort, I do assure you!

我向你保证，没有这种东西！

保证

1·Nothing will assure permanent happiness to me.

没有什么能保证我永远幸福。

2·I assure you I was, 'she returned.

“我跟你保证我说的是事实话，”她回答。

3·But any code that is submitted into the product needs to follow best practices to assure its stability, reliability, and maintainability.

但是任何的代码在提交到产品前，都需要遵照最佳实践，来保证它的稳定性和可维护性。

4·She feels very strongly about taking immediate action to assure we get there on time.

她非常强烈地要求立即采取行动以保证我们能准时地到达。

5·The database size should not steadily increase in an uncontrolled manner to assure system health.

为了保证系统的健康状态，数据库的规模不应该无限制地增长。

担保

1·I assure you that she can be trusted to do the job.

我担保她能做好这项工作。《新英汉大辞典》

2·System of project assure has active significance on norm action of building market and strengthen credit.

工程担保制度对规范建设市场行为、强化守信遵约具有积极意义。

3·But the assure system also leads to such questions as moral hazard and adverse selection. So we need the regulation system of capital adequacy ratio.

但是，担保制度又导致了银行经营者的道德风险和逆向选择，因此需要资本充足率监管制度。

4·It is not my fault that I cannot eat or rest, 'he replied.' I assure you it is through no settled designs.

“我不能吃、不能睡，可不能怪我，”他回答。“我跟你担保这不是有意要这样。”

5·Experts assure us of the potential of this theory and I for one am quite prepared to believe them.

专家们为我们担保了该理论的潜力，而我也是准备好相信他们的人中的一员。

包管

1·We hope this will be a good start for profitable business relations and assure you that your offer will receive our careful consideration.

希瞧这将是我们互利贸易往来的良好起头。我们包管将对贵方的报价予以卖真的考虑。

(1)assure oneself弄清楚，查明

(1)assure ofvt. 向...保证）；查明（使相信