我保证他能完成这项任务。

I will answer for it that he will accomplish the task.

youdao

我的儿子完成一项任务时，我就忍不住表扬他。

When my son completes a task, I can't help but praise him.

youdao

他答应在六月底完成这项工作，我相信他会履行诺言。

He has promised to finish the job by June and I am sure he will deliver.

《牛津词典》

In Copenhagen, he completes the manuscript and -I'm going to write MS for manuscript completes the manuscript, and submits this for publication.

在哥本哈根，他完成了初稿,我将写完硕士论文初稿,完成了初稿，并且提交去发表。

麻省理工公开课 - 固态化学导论课程节选

That doesn't mean it's better, it just means that I'm making up for a problem that he created.

这不是说我讲得更好，而是帮他完成,遗留下来的问题。

麻省理工公开课 - 热力学与动力学课程节选

"I must embody it in the completion of my life.

人可以表现他不理解的真理],我须完成人生才能表达。

耶鲁公开课 - 现代诗歌课程节选