And so the thing to do, unless you have something else, you would go for your sword.

怎么办呢,除非你有别的东西可以当做武器,不然就只能拔剑战斗了

耶鲁公开课 - 古希腊历史简介课程节选

I thought I still have to work for another 30, 40 years. I need to do something else.

我原本想，我还必须工作三四十年。但我需要做点别的事情。

怡人的的汉普斯特德 - SpeakingMax英语口语达人

or, to express the need for somebody else to either do something or have something.

也可以表达其他人做某事的必要或对某物的需求。

I need 课堂 - SpeakingMax英语口语达人

Here's something else we have to do in here.

我们接下来要做的

耶鲁公开课 - 聆听音乐课程节选

you can use the "you have to" pattern to express something that somebody else really must do.

你可以用“you have to”句型表明一些其他人必须做的事。

have to 课堂 - SpeakingMax英语口语达人

Or a need for somebody else to do or have something.

或者是其他人的类似需求。

I need 课堂 - SpeakingMax英语口语达人