But there is no official stamp on your permit; this is most irregular.

你的许可证上没有公章，这太不合常规了。

To go away without telling your father is most irregular.

不跟你父亲打个招呼就走是非常不合适的.

If that was the case it was of course most irregular .

恐怕这就是那个案子的不寻常之处。

To go away without telling your father is most irregular .

不跟你父亲打个招呼就走是非常不合适的。