One of the things I think was really useful for me developing just how I think about Israel.

我认为有件事对我非常有用,它使我形成了对以色列的看法。

普林斯顿公开课 - 人性课程节选

And it's a useful pattern when you want to express that your feelings have been hurt or that you're not liking something,

当你想表达你在情感上受到了伤害或者不喜欢某件事的时候，这是个很有用的句型。

I get so upset 课堂 - SpeakingMax英语口语达人

There's nothing useful to do.

没什么有用的事可以做。

麻省理工公开课 - 计算机科学及编程导论课程节选

that might have been applied in more... more efficient ways to society.

我们本来可以更有效率地利用这些时间，做对社会更有用的事。

选美大会，很不错 - SpeakingMax英语口语达人

You'll find "That's all" very useful to express what you have or to put a stop to something.

你会发现 “That's all” 是个非常有用的句型。你可以用它来给一件事画个句号。

That's all课堂 - SpeakingMax英语口语达人