Why go to the expense of buying an electric saw when you can borrow one?

你能借到电锯，却为何去花钱买呢？

《柯林斯英汉双解大词典》

Why go to another project now?

现在，为什么要到另一个项目？

youdao

So why go to all this effort?

那么这一切努力又是为了什么？

youdao

I did not understand. "But,Dupin," I said, "why did you go to the trouble of replacing the letter?

VOA: special.2009.12.26

Lane looked faintly interrupted. "Why what?" " Why did you think it was going to go over like a lead balloon?"

莱恩微弱的问，什么为什么“,为什么你认为它像一个领头气球“

耶鲁公开课 - 1945年后的美国小说课程节选

But you have to submit your test scores, you have to write some essays, like why you want to go to Brown.

但是你必须提交你的成绩单，还要写一些文章，例如你为什么选择布朗大学。

被学问的自由所迷住 - SpeakingMax英语口语达人

Of course, if classroom content is available digitally, why go to class at all?

FORBES: Digital Teaching Promises to Improve Grades

Why go to foreign platforms if the rules are the same and perhaps invite more IRS questions?

FORBES: Long Arm Of Congress Leans On Forex Traders

Why go to all this effort, especially when, unlike Intel, Cisco operates exclusively in a corporate market?

ECONOMIST: High-tech brands