Why did you do that?

你为什么要这样做?

Why did you do that?

你为什么要这样做?

I have my own reason.

我自有道理。

It may prove unworkable.

这可能是行不通的。

It may prove unworkable.

这可能行不通的。

But there still exists possibility.

但还是有可能行得通的。