Li Ping doesn't know why to learn English.

李平不知道为什么学英语。

youdao

It is my conviction that people here do not take the Chinese language seriously enough. The main reason is that they don't know why to learn Chinese. There is a lack of motivation to do so.

我总觉得很多人不大重视华语，主要的原因是不知道为什么要学习华语，也就是说缺乏动机。

youdao

They are using radars and other equipment to learn more about how, why and where tornadoes form.

VOA: special.2009.06.09

The notion of recipes, the notion of computation, why you want to do this, what you're going to learn.

秘诀和计算的一些概念啊，以及我们为什么要学这些知识，和要学习的具体内容。

麻省理工公开课 - 计算机科学及编程导论课程节选

and you know like, "Why do you want to learn?" "So you can make money."

然后你可以问“为什么想学习？”，“可以赚钱”。

记忆深刻的研究 - SpeakingMax英语口语达人

We can continue to trade within a range, that is why you need to learn how to trade the markets.

FORBES: The Trend Is Your Friend If You're Bullish

Which is why I decided to learn more about their plight and our nation's legal and social response.

CNN: Don't turn your back on these children

As I counted the hours on my last day at Desert Rhino Camp, I tried hard to remind myself of why I was there: to learn about rhino conservation, not to tick off a sighting.

BBC: Saving rhinos in Namibia