He emails every week without fail.

他每周必定发电子邮件。

I want you here by two o'clock without fail.

我要你两点钟务必来到这里。

On the 30th you must without fail hand in some money for Alex.

在30号你务必亲手交给亚历克斯一些钱。

He attended every meeting without fail.

他逢会必参加。

"I'll be back in one hour without fail," answered the Marionette.

“我一小时后一定回来。”木偶回答说。