understand why引导什么从句

I could never understand why she was fired.

我怎么也不明白她为何被解雇。

I still don't understand why you chose that name in the first place.

我仍不明白，你究竟为什么取了这么个名字。

I can't understand why they don't want us.

我不明白为什么他们不要我们。

I can't for the life of me understand why you didn't think of it.

我无论如何也无法理解你为什么没想到这个。

One will never be able to understand why these political issues can acquire such force

人们永远也不会明白为什么这些政治问题会有如此大的影响力。