I need to know why you love me.

你不知道我是谁，但是你知道你爱我。

youdao

I need to know what happened. I need to know why they're gone.

我需要知道究竟发生了什么事情，我需要知道他们为什么要走。

youdao

The persistent question of "Why do I need that?"—or, perhaps more tellingly, "Why do you need to know that?"—dogs the steps of many new ventures.

一个挥之不去的问题阻碍了许多新企业的脚步，即“我为什么需要它？”或者，也许更能说明问题的是，“为什么你需要知道这个？”

youdao

"I also want to know why is it that when a council is found to be in need of special measures even then local government leaders are so loath to act, " the minister said.

BBC: Make education bosses more accountable, says minister

So -- but you need to -- I just want you to know, it's not like we haven't thought of why don't we use the SBA. We have.

WHITEHOUSE: Creating New Jobs by Investing in High-Speed Rail