真正的原因用英语怎么写

The real reason

原因───reason;真正───real

I reckon she has good reason to feel smug.───我认为她洋洋得意必有其缘故.

I'd like to know the reason why you're so late.───我想知道你为什么迟到那么长时间。

That is ( the reason ) why he raised the question.───这就是他所以提出问题的原因.

Their reason for doing it is still a puzzle to me.───他们为什么干那件事仍然让我费解.

For some reason, the curtains were shut.───不知什么原因，窗帘拉着。

Lack of security of tenure was a reason for many families becoming homeless.───居住权得不到保证是许多家庭居无定所的一个原因。

I had no reason to doubt him.───我没有理由不相信他。

There is no reason that you shouldn't tell them in advance when you are going.───你没理由不事先告诉他们你打算要走.