I assure you that would never happen again.

我向你保证这种事情再也不会发生了。

I hope it's the last time.
我希望这是最后一次。
I assure you that would never happen again.
我向你保证这种事情再也不会发生了。
Please, I promise this is the last time.
求你 了，我保证这是最后一次。
Within two weekSj I promise.
两个星期内，我保证。

He always keeps his words.

他总是信守诺言。

Mike is a person worth depending on.
迈克是一个值得信赖的人。
Yes, he always keeps his words.
是的，他总是信守诺言。
This is a promise, and I never break one.
这是承诺，我从不食言。
You should never go back on your promise.
你千万不要食言。
Once he made a promise of help, he would never fall back.
他一旦答应带忙，就决不会食言。
I'm the last person to eat my words.
我是最不可能食言的人了。